How to calculate instantaneous velocity in Physics

If it's a senior one problem, it's solved by the speed formula. The most basic thing is to use the limit idea

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1. A sector with a radius of 30 cm and a central angle of 120 ° is used to form the side of a cone. What is the total area of the cone
2. Answers to the 16th issue of mathematics learning report for Grade Seven
3. If the circumference of a circle is 12.56 meters, what is its radius______ The area is______ ．
4. A regular prism has 2010 edges, one side edge is 10cm long, and one bottom edge is 1cm long. How many prisms is this?
5. Simplification: - P & sup2; cos180 ° + qsin9 ° - 2pqcos0 ° Simplification - P & sup2; cos180 ° + qsin9 ° - 2pqcos0 °
6. The displacement of a particle in the first △ t time is S1, and the displacement in the second △ t time is S2. Calculate the average velocity and the instantaneous velocity in the middle time The displacement of a particle is S1 in the first △ t time and S2 in the second △ t time The average speed in these two periods___________ The instantaneous velocity at the middle of the two periods______________
7. The usage of dashes: 1. Explanation; 2. Progressive meaning; 3. Turning meaning; 4. Continuation of sound; 5. Beginning and ending A. The express train from Beijing to Wuhan can arrive in 12 hours. B. We are Chinese, we love our motherland. C. We will never forget that day - October 12, 1952. D. I'd like to wear this prison. E. he doesn't like to travel in the park by coach unless he wants to show off his new clothes
8. The center of the ellipse is at the origin of the coordinate, the focus is on the y-axis, the focal length is 8, and the standard equation of the ellipse is obtained by passing through the point (3.0)
9. The circumference of a rectangle is 40cm. The width is ACM and the length is cm
10. What fraction of an hour is 2 hours 15 minutes RT is a short answer question, please don't give an answer 3Q directly
11. A rectangle and a square of equal area have larger sides
12. What does x = - B / 2A mean in quadratic function? Does x refer to abscissa
13. As shown in the figure, two identical right triangles are stacked together to find the area of the shadow part. (unit: cm)
14. （1＋0.228-0.21）x(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)x(0.228-0.21)
15. Find the L2 equation of the line L: x + 2Y + 1 = 0, which is symmetric with respect to the line L: 3x-y-1 = 0
16. Practical questions on score of PEP fifth grade volume 2 (15 questions)
17. F1 (- 3,0) and F2 (3,0) are the two focal points of the ellipse x ^ 2 / A + y ^ 2 / b = 1. When p is on the ellipse, ∠ f1pf2 = 120 °, the triangle f1pf2 has the largest area, a + B I have worked out that s = √ 3B doesn't seem to have a maximum?
18. What are the quadrilaterals we've learned______ 、______ 、______ And______ ．
19. Parabola (definite integral) Find the parabola that passes through the point (0,0) and the axis of symmetry is parallel to the Y axis with the opening downward, so as to minimize the area enclosed by the X axis!
20. Set a has n elements, how many subsets of a and how many proper subsets of a