A ball with a momentum of 4.0 kg#*#m/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball's momentum?

1 Answer
ali ergin
Dec 13, 2016

#"change in the ball's momentum is : "Delta P=-8" "kg*m/s#

Explanation:

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#P_b " represents momentum of ball (before hitting)"#
#P_b=4.0" " kg*m/s#
#P_a " represents momentum of ball (after hitting)"#
#P_a=-4.0" "kg*m/s#

#Delta P:"change of momentum"#

#Delta P=P_a-P_b#
#Delta P=-4.0-4.0#

#Delta P=-8" "kg.m/s#

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