A hockey ball of mass 200g is traveling at 10 m/s and is struck by a hockey stick, so as to return it along its original path with a velocity of 50 m/s. Calculate the change of momentum occurred in the motion of hockey ball by the force applied by the hockey stick.

Q. A hockey ball of mass

50 g

travelling at

20 m / s

is struck by a hockey stick. So as to return it along its original path with a velocity at

20 m / s

. Its change in momentum occured in the motion of the hockey ball by the force applied by the hockey stick:

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A puck of hockey is sliding on the ice with a momentum of 5 kg-m/s when it is struck by a hockey stick giving it an impulse of 100 N. s in the direction of motion of the puck. Calculate the momentum of the puck after hitting by the hockey stick ?

The correct option is C 105 kg.m/s.Initial momentum of the puck Pi=5 kg m/sImpulse given J=100 N.sImpulse J=ΔP=Pf−Pi ∴ 100=Pf−5 ⟹Pf=105 kg m/s

The correct option is C 105 kg.m/s.
Initial momentum of the puck $P_{i} = 5$ kg m/s
Impulse given $J = 100$ N.s
Impulse $J = Δ P = P_{f} - P_{i}$
$∴$ $100 = P_{f} - 5$ $⟹ P_{f} = 105$ kg m/s