A 0.0420-kg hallow racquetball with an initial speed of 12.0m/s collides with a
ID: 1662949 • Letter: A
Question
A 0.0420-kg hallow racquetball with an initial speed of 12.0m/s collides with a backboard. It rebounds with a speed of 6.0m/s a) calculate the total impulse on the ball b) If the contact time lasts for 0.040 s, calculate theaverage force on the ball. A tenis player receives a shot with the 60.0 g ball travelinghorizontally at - 50.0 m/s, and returns the shot with the balltraveling horizontally. The tennis ball and the tennis racket arein contact for 1.00X10^-3 s. The average force exerted on the ballby the tennis racket is 5.701X10^3N. Find the speed of the tennisball after it leaves the racket. ***Please use Significant Digits, and show your work, so I canunderstand how to do this in the future... A 0.0420-kg hallow racquetball with an initial speed of 12.0m/s collides with a backboard. It rebounds with a speed of 6.0m/s a) calculate the total impulse on the ball b) If the contact time lasts for 0.040 s, calculate theaverage force on the ball. A tenis player receives a shot with the 60.0 g ball travelinghorizontally at - 50.0 m/s, and returns the shot with the balltraveling horizontally. The tennis ball and the tennis racket arein contact for 1.00X10^-3 s. The average force exerted on the ballby the tennis racket is 5.701X10^3N. Find the speed of the tennisball after it leaves the racket. ***Please use Significant Digits, and show your work, so I canunderstand how to do this in the future...Explanation / Answer
1) A 0.0420-kg hallow racquetball with an initial speed of12.0 m/s collides with a backboard. It rebounds with a speed of 6.0m/s. a) calculate the total impulse on the ball.impulse = change in momentum = final momentum - initial momentum =.042*6 - .042*(-12) = .756 kg.m/s
b) If the contact time lasts for 0.040 s, calculate theaverage force on the ball.
impulse = Ft = f*.04 = .756
F = 18.9 N
2) A tenis player receives a shot with the 60.0 g balltraveling horizontally at - 50.0 m/s, and returns the shot with theball traveling horizontally. The tennis ball and the tennis racketare in contact for 1.00X10^-3 s. The average force exerted on theball by the tennis racket is 5.701X10^3N. Find the speed of thetennis ball after it leaves the racket.
Ft = 5701*.001 = impulse = .06*v - .06*(-50) = .06(v+50)
v = 45.02 m/s
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