Just before hitting the ground, a rubber superball has a downward velocity of 7.
ID: 2058836 • Letter: J
Question
Just before hitting the ground, a rubber superball has a downward velocity of 7.67 m/s. Immediately after bouncing, the upward velocity is 3.53 m/s. If the ball's mass is 100g, and the average force on it while in contact with the ground was Favg = 112 N in the positive Y direction, how long was the ball in contact with the ground? Give your answer in milliseconds.I worked out the problem and got that it equals 10 milliseconds. If someone could confirm or disagree with me with their own calculations I would appreciate it. I will rate lifesaver :)
Explanation / Answer
Force = rate of change of momentum
F = dp/dt
=> dt = dp/F = 0.1(3.53+7.67)/112 = 10 ms
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.