Question

A hockey ball of mass 200 g traveling at 10 m s -1 is struck by a hockey stick so as to return it along its original path with a velocity at 5ms^-1. Calculate the change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.

Answer 1

Answer:

3kgms⁻²

Explanation:

Change in momentum=m(v-u) ; where m=mass of object

                                                               v=final velocity

                                                               u=initial velocity

so using the above formula,u=10 ; v=-5 ;m=0.2 kg

Note: It is given as velocity not speed, hence direction matters. Since the ball returns to its original path, the direction is reversed; hence -ve sign.

so putting values in the equation,Δp=0.2(-15)=3kgms⁻²

*** -ve sign indicates the direction.You can ignore it ***

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hope it helped !!