Science

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 at 5 ms^-1. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

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Given,

Mass (m) = 200 g

Initial velocity (u) = 10 ms^-1

Final velocity (v) = -5 ms^-1

Initial momentum of the ball = mu = 200 × 10 = 2000 gms^-1

Final momentum of the ball = mv = 200 × -5 = -1000 gms^-1

∴ The change in momentum (mv - mu) = -1000 - 2000 = -3000 gms^-1

Convert gms^-1 to kgms^-1 :

1000 gms^-1 = 1 kgms^-1

So, 3000 gms^-1 = $\dfrac{3000}{1000}$ = -3 kgms^-1

Hence, momentum of the ball reduces by 3 kgms^-1 after being struck by the hockey stick.

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