Question #79014

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Answer 1 · 2018-01-06T22:53:38

A: #p_A = -0.7# kg m/s
B: #p_B = 0.56# kg m/s
C: #Deltap = 1.26# kg m/s

#p = mv#
momentum = mass * velocity
(NB: velocity is downwards, so it is negative)

momentum while falling downward = #280g * -2.5# m/s

#280g = 0.28 kg#

#mv = 0.28 * -2.5#

#p_A = -0.7# kg m/s

momentum while rebounding = #280g * 2.0# m/s

#mv = 0.28 * 2.0#

#p_B = 0.56# kg m/s

change in momentum = momentum while rebounding - momentum while falling downward

#Deltap = p_B - p_A#

#= 0.56 - (-0.7)#

#= 1.26#

#Deltap = 1.26# kg m/s