Question

A hockey ball of mass 400g travelling at 10m/s is stuck by a hockey stick so as to return it along its original path with a velocity of 4m/s calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick

Answer 1

Given:-

• Mass of Hockey ball = 400g → 0.4kg

• Initial Velocity of ball = 10m/s

• Final Velocity = - 4m/s ( As it moves in Opposite Direction ).

To Find:-

• Change in momentum of the Hockey ball

Formulae used:-

• Change in Momentum = mv - mu

Where,

• m = Mass
• v = Final Velocity
• u = initial velocity

Now,

→ Initial momentum = mu → 0.4 × ( 10 )

→ Initial momentum = 4kgm/s

→ Final momentum = mv → 0.4 × ( - 4)

→ Final momentum = → -1.6kgm/s

Therefore,

→ Change in momentum = mv - mu

→ Change in momentum = -1.6 - 4

→ Change in momentum = -5.6kgm/s.

Hence, The Change in momentum is -5.6kgm/s