A 0.060 kg tennis ball, initially moving at a speed of 12 m/s,is truck by a rack

Question

A 0.060 kg tennis ball, initially moving at a speed of 12 m/s,is truck by a racket causing it to rebound in the oppositedirection at a speed of 18 m/s. What is the change in momentumof the ball?
(The answer is 1.8 kg m/s) Please show all work, in order to receive a rating ofLifesaver! Thank you so much! :) A 0.060 kg tennis ball, initially moving at a speed of 12 m/s,is truck by a racket causing it to rebound in the oppositedirection at a speed of 18 m/s. What is the change in momentumof the ball?
(The answer is 1.8 kg m/s) Please show all work, in order to receive a rating ofLifesaver! Thank you so much! :)

Explanation / Answer

A Tennis ball having a mass m = 0.060kg          Initialmoving speed   v i = 12 m/s        final speed which isrebound in opposite direction is v f = - 18m/s                 Initial momentum pi = mvi                                                = 0.060 kg * 12 m/s                                                = 0.72 kg m/s                   Final momentum p f = m vf                                                    = 0.060 kg * ( - 18 m/s )                                                      =- 1.08 kg m/s                  change in momentum p = pi -pf                                                          = 0.72 kg m/s - ( - 1.08 kg m/s )                                                         = 1.8 kg m/s

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