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 Form 3 Physics Newton's laws of motion questions and answers

A tennis ball of mass 100 g is struck by a tennis racket. The velocity of the ball is changed as shown. What is the magnitude of the change in momentum of the ball?

 (4m 4s)
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Answer Text:
Change = mv-(-mv)
= #0.1kg times 20 - (- 0.1 times 30)#
= 5Kgm/s