Question

An object of mass 1kg travelling at 10ms^-1 is struck by a hockey stick so as to return it along its original path with a velocity at 5ms^-1. Calculate the magnitude of Change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Class 9
Physics

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Answer 1

Answer:

ANSWER

Mass of ball(m)=200g=0.2kg

Initial velocity of ball(u)=10ms

−1

Final velocity of ball(v)=5ms

−1

Therefore, change in momentum (△p) = Final momentum - initial momentum =m(v−u)=0.2×(−5−10)=−3 kgms

−1

=−3 Ns

Answer 2

Answer:

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Question :- A hockey ball of mass 200g travelling at 10ms −1 is struck by a hockey stick so as to return it along its original path with a velocity at 5ms −1 . Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Answer :- Mass of hockey ball m=200g=0.2Kg

Initial velocity u=10ms −1

Final velocity v=5ms −1

Since the momentum of the ball = Final momentum – initial momentum,

=mv–mu

=m(v–u)

=−0.2(−5–10)

=0.2×−15=−3Kgms −1

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