Question

A hockey ball of mass .2 kg travelling at ms-¹ is struck by a hockey stick so as return it along its original path with a velocity at 2m/s. calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick?
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Answer 1

$\:\:\bigstar\rm\blue{GIVEN}\:\:\bigstar$

• $\rm\red{Mass\:of\:Ball=2kg}$

• $\rm\red{Initial\:Velocity=6m/s}$

• $\rm\green{Final\:Velocity=2m/s^-1}$

$\:\:\bigstar\rm\blue{To\:Find}\:\:\bigstar$

• The Change of Momentum occured.

$\:\:\bigstar\rm\blue{FORMULAE\:USED}\:\:\bigstar$

• ${\boxed{\rm{\blue{mv-mu}}}}$

Where,

v= Final Velocity

M= Mass

U= initial Velocity.

Now,

$\implies\rm\blue{mv-mu}$

$\implies\rm\blue{(2)(2)-(2)(6)}$

$\implies\rm\blue{4-12}$

$\implies\rm\blue{-8kgm/s}$

Thus, The change in momentum is -8kgm/s^1.

$\rm\blue{MORE\:TO\:KNOW}$

• $\rm\blue{v=u+at}$

• $\rm\red{s=ut+\dfrac{1}{2}a(t)^2}$

• $\rm\blue{v^2-u^2=2as}$