81 how long does it take for 100 meters (free fall)?
S=1/2gt²
t=√2S/g
=√(2X100/9.81)
=√20.39
=4.52 (SEC)
Let G be 10
RELATED INFORMATIONS
- 1. How to calculate acceleration when displacement and time are known
- 2. On the formulas of acceleration and displacement
- 3. The initial velocity, the final velocity and the displacement are known It's better to have a derivation process
- 4. A formula for calculating the acceleration of a uniform speed varying linear motion
- 5. For an object moving in a straight line with uniform velocity, the acceleration is a, the displacement in time t is x, and the final velocity is v. the expression of the motion of the object is?
- 6. What is the velocity formula derived from the definition of acceleration? What is the average velocity formula of uniform linear motion? What is the displacement formula of uniform linear motion What is the velocity formula derived from the definition of acceleration? What is the average velocity formula of uniform velocity linear motion? What is the displacement formula of uniform velocity linear motion?
- 7. A formula for calculating the velocity of linear motion with constant acceleration? (constant acceleration, not constant speed change) Acceleration a = (mg KS) / g, where m, G and K are known constants. The above formula is the functional relationship between acceleration a and displacement S. let the velocity of the object at the beginning and the end be 0. Can we give the formula for calculating the velocity of the object at time t? If not, what conditions are needed? I made a mistake. It should be a = (mg KS) / m
- 8. What is the formula of the velocity of the middle position of the uniform velocity linear motion?
- 9. Derivation of instantaneous velocity formula for middle position of a section of displacement Midpoint of displacement: v = root sign [(square of V0 + square of VT) / 2] How did you get out?
- 10. How to deduce the formula of velocity in the middle position of uniform acceleration motion
- 11. Formula 1: S = vt Formula 2: v = at (a is acceleration) Formula 3: S = (at ^ 2) / 2 Substitute formula 2 into formula 3 to get formula 4: S = VT / 2 Q: Formula 1 obviously conflicts with formula 4. What's wrong?
- 12. Know the distance
- 13. How many formulas are there for calculating acceleration?
- 14. A and B set out at the same time from a and B which are 180 km apart. A rides a bicycle and B rides a motorcycle. They travel at a constant speed along the same route. It is known that a's speed is 15 km / h and B's speed is 45 km / h. how long does it take for them to meet each other?
- 15. Party A and Party B rode bicycles to each other from ab at the same time and met three hours later. When they met, Party A traveled 18 kilometers more than Party B. It is known that the speed ratio of Party A and Party B is 3:1 How many kilometers per hour does a travel? Don't do those / * ones 3:2
- 16. The two cars are facing each other. They meet in six hours. After four hours, the bus arrives. The truck is 188 kilometers away. What's the distance between the two places?
- 17. Wahaha mineral water is priced at 1.2 yuan per bottle. At present, a and B shopping malls offer preferential policies: 10% off for the whole market of a and 20% off for more than 20 bottles of B If you are a consumer, which shopping mall is more suitable It's a description of the situation
- 18. There are three drawers in the teacher's desk. Each drawer is 3.8 decimeters long and 2.2 decimeters wide. How many square meters does it take to make these three drawers Xiaoqiang's bedroom should be paved with 3cm thick wooden floor. The bedroom is 5m long and 4m wide. How many cubic meters of wood does it need at least? Use it quickly,
- 19. Chicken and rabbit have 35 heads and 100 feet. How many do they have? A linear equation with one variable is formulated, Note: it is a linear equation with one variable~
- 20. The formula of calculating overtime and late time with Excel I go to work at 8 a.m. and I'm late if I'm over 8 a.m =Text (mod (c2,1) + 0.625 - (weekday (c2,2) > 5) / 48, "[1.125]; late" I go to work at 8:00 in the morning. I'm late when I'm over 8:00 in the morning. I'm late when I'm over 13:30 in the afternoon. How can I use the formula to calculate the time in minutes? Because of the heavy workload, I want to ask the experts to give a formula to avoid repeated labor and improve work efficiency Name registration number date time machine number comparison method late late time overtime Lola 143 2010-12-1 8:00 1 fingerprint Lola 143 2010-12-1 12:19 1 fingerprint Lola 143 2010-12-1 12:21 1 fingerprint Lola 143 2010-12-1 13:29 1 fingerprint Lola 143 2010-12-1 17:51 1 fingerprint Lola 143 2010-12-2 12:04 1 fingerprint Lola 143 2010-12-2 13:29 1 fingerprint Lola 143 2010-12-2 17:42 1 fingerprint Lola 143 2010-12-2 23:52 1 fingerprint Lola 143 2010-12-3 8:03 1 fingerprint Lola 143 2010-12-3 12:03 1 fingerprint Lola 143 12 / 3 / 2010 13:30 1 fingerprint Lola 143 2010-12-3 17:48 1 fingerprint Lola 143 2010-12-3 19:59 1 fingerprint Lola 143 2010-12-3 22:10 1 fingerprint The perfect solution is plus points Your answer is very good, but I would like to ask: how is 0.666 in text (mod (c2,1) + 0.666 calculated