Speed is a physical quantity that describes the speed and direction of an object, Why do some exercises only write "describe how fast an object moves" without mentioning direction

Speed is a physical quantity that describes the speed and direction of an object, Why do some exercises only write "describe how fast an object moves" without mentioning direction

Speed is a physical quantity that describes the speed and direction of an object. It's right. It means that it can describe both the speed and the direction of motion. So if I ask you whether speed can describe the speed of motion, it's certainly right. If I ask you whether you can describe the direction of motion, it's also right

The definition of speed is a physical quantity that describes how fast an object moves. Is it wrong?
Shouldn't it be a physical quantity that describes the speed and direction of an object's motion? Isn't speed a vector? I really don't understand. I hope I can answer it in detail

You're right, but the speed here should be equal to the speed. It's understandable that the person who wrote the question was negligent

What is the difference between the velocity at the midpoint and the velocity at the midpoint? What are the formulas?

Velocity at midpoint: instantaneous velocity at displacement midpoint v = 0.5 * under root sign (V initial velocity ^ 2 + final velocity ^ 2)
, and the speed at the midpoint: the instantaneous speed at half of the whole time, equal to the average speed. V = 0.5 (initial speed + final speed)

Assuming that the initial velocity is 1, the distance to the end point is also 1, it goes straight to the end point, and the velocity is always equal to the distance to the end point, the relationship between velocity and time is obtained

Let f (x) be the function of the distance traveled, then f '(x) be the function of the velocity. (x is the time). Then f' (x) + F '(x) = 0 is derived from the differential of F (x) + F' (x) = 1. Then f '(x) / F' (x) = 1. Ln f '(x) = - x + C. (C is the integral constant.) the solution is f' (x) = [(1 / E) ^ x] e ^ C

What is the relationship between time and distance?

For uniform motion:
Distance = speed × time

The speed is fixed, the distance is proportional to the time______ Proportion. A certain distance, speed and time______ Proportion

(1) Because the distance △ time = speed (certain), is a certain ratio, in line with the meaning of positive proportion, so the speed is certain, the distance and time are in positive proportion; (2) because the speed × time = distance (certain), is the product of certain, in line with the meaning of inverse proportion, so the distance is certain, the speed and time are in inverse proportion; so the answer is: positive, negative

What is the relationship among distance, time and speed______ ．

The relationship among distance, time and speed is: speed × time = distance, distance △ time = speed, distance △ speed = time. So the answer is: speed × time = distance, distance △ time = speed, distance △ speed = time

If time is fixed, what is the proportion between speed and distance?
What is speechless is whether they are related
Is it positive or negative.

If the time is fixed, the distance is proportional to the speed

What is the relationship between speed, time and distance
Distance = speed × time
Time = distance △ speed
Speed = distance △ time
That's all. I'll let you know when I know more

Distance = speed × time
Speed = distance △ time
Time = distance △ speed
When the distance is fixed, the faster the speed is, the shorter the walking time is
When the speed / time is constant, the distance is proportional to the time / time
It's my pleasure to answer your questions
If you don't understand this question, you can ask,

Tell you the speed ratio, how to find the distance ratio and the time ratio

If you know the speed ratio, distance and time, you can know the ratio of the other
If the distance is fixed, time and speed are inversely proportional
If the time is fixed, the distance is proportional to the speed