Question

A tennis player hits a 0.1-kilogram tennis ball with her racket from the north end if the court. Her racket was traveling at 65 kilometers over hour. The ball accelerated at a rate of 10 meters per second square. The ball hits the floor on the south end of the tennis court. How much force did the floor on the south end of the court exert on the ball?

A. 7.5 N

B. 0.01 N

C. 1 N

D. 6.5 N

Answer 1

Use Newton's 2nd law: F = m a.

m = 0.1 kg, a = 10 m/s^2, so F = 0.1 × 10 = 1 N.

Answer: C (1 N).