Question

at the Wimbledon tennis championships balls are tested by dropping them through a hole in the ceiling of a 3m tall room.

a) ignoring air resistance, find the speed of the .1kg tennis ball when it strikes the ground.

b) the ball bounces off the floor and travels straight back up with half of the speed at which it hit the ground. (in other words, half of your answer from part a) if the ball and the flor were in contact for 0.5 milliseconds, calculate the average force that the floor applied to the ball during the impact (bounce).

Answer 1

Concept - used equation of kinematics to find the speed of the ball just before it strikes the ground. For the next part use the fact that rate of change of momentum is equal to force***********************************************************************************************
This concludes the answers. If there is any mistake or omission, let me know immediately and I will fix it....

0 23(sm) 7 7mls When it shrile it has spee?, V = 7.7m1s ator bounce = 3 83 ms 2 up as positive Talke - m 42)) P- P=m AP - mv2 mv vet 1 15 ms 0-119 FAP OP 2300 N (0-5X10