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A hockey ball of mass $200\ g$ traveling at $10\ ms^{-1}$ is struck by a hockey stick so as to return it along its original path with a velocity at $5\ m s^{-1}$. Calculate the magnitude of change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.
Given: A hockey ball of mass $200\ g$ traveling at $10\ ms^{-1}$ is struck by a hockey stick so as to return it along its original path with a velocity at $5\ m s^{-1}$.
To do: To calculate the magnitude of change of momentum that occurred in the motion of the hockey ball by the force applied by the hockey stick.
Solution:
Here mass of the ball $m=200\ g=\frac{200}{1000}\ kg.=\frac{1}{5}\ kg.$
Initial velocity $v_1=10\ ms^{-1}$
Final velocity $v_2=5\ ms^{-1}$
Therefore, change in momentum $\vartriangle P=mv_2-mv_1$
$=m(v_2-v_1)$
$=\frac{1}{5}\ kg.\times(10-5)ms^{-1}$
$=1\ kg.ms^{-1}$
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