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Standard XII
Physics
Question

A hockey ball of mass 200 g travelling at 10 ms−1 is struck by a hockey stick so as to return it along its original path with a velocity of 5 ms−1. Calculate the change of momentum which occurred in the motion of the hockey ball by the force applied by the hockey stick:
  1. −3 Ns
  2. 3 Ns
  3. 6 Ns
  4. −6 Ns

A
3 Ns
B
−6 Ns
C
−3 Ns
D
6 Ns
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Solution
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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

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