Question

A hockey ball of mass 250gm travelling in 12 m/s is struck by a hockey stick so as to
return it, along its original path with a velocity of 6 m/s. Calculate the change of
momentum occurred in the motion of the hockey ball by the force applied by the
hockey stick

Answer 1

Hi,

Given:

Mass of the ball(m)=250gm=0.25kg

Initial velocity(u)=12m/s

Final velocity(v)= -6m/s(The negative sign is taken here because ball is moving in the opposite direction)

To Find:

Change in momentum

Solution:

The initial momentum is given by the equation

p1=mu

Substitute the values in the given equation

We get,

p1=0.25×12=3kg m/s

The final momentum is given by the equatio

p2=mv

Substitute the values in the equation

We get,

p2=0.25×-6

p2= -1.5kg m/s

Change in momentum= Final momentum- Initial momentum

                                    = -1.5-3= -4.5kg m/s

The negative sign is because the change in momentum is in the opposite direction

Hope this helps you.

Answer 2

Answer:

change the momentum= final momentum- intial momentum

1.5-3 =- 4.5kg m/s