A solid plastic sphere falls towards the Earth. The diagram below shows the speed-time graph of the fall up to the point where the sphere hits the Earth's surface. 

a. Describe in detail the motion of the sphere shown by the graph.

b. Draw a circle to represent the sphere, and add arrows to show the directions of the forces acting on the sphere when it is at the position shown by point S on the graph. Label your arrows with the names of the forces.

c. Explain why the sphere is moving with constant speed at S.

d. Use the graph to calculate the approximate distance that the sphere falls

i. Between R and T,

ii. Between P and 0.

Transcribed Image Text:

100 R. speed 120 m/s 100 80 60 20 10 20 30 40 50 60 80 90 100 110 time/s