Question

a hockey stick of mass 200g hit on a hockey stick with a velocity of 10m/s find the change in momentum if the ball bounces back through the same path with same speed
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Answer 1

Given :

• mass=200g

• velocity=10m/s

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To Find :

•The change in momentum if the ball bounces back through the same path with same speed =?

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Solution :

$\\ \implies \sf \: mass = 200g = \frac{200}{1000} = 0.2kg \\ \\ \implies\boxed{ \sf{mass = 0.2kg}} \\ \\ \implies \sf \: initial \: momentum = mu \\ \\ \implies \sf \: initial \: momentum = 0.2 \times 10 = 2kg \frac{m}{s} \\ \\ \implies \sf \: final \: momentum = mv \\ \\ \implies \sf \: final \: momentum = 0.2 \times 10 = 2kg \frac{m}{s} \\ \\ \implies \sf \therefore \: \: change \: in \: momentum = mv - mu \\ \\ \implies \sf \: change \: in \: momentum = - 2 - 2 \\ \\ \implies \sf \: \: change \: in \: momentum = - 4kg \frac{m}{s}$

$\\ \implies\boxed{\sf{Change \: in \: momentum =-4kgms^{-1}}}$

Therefore ,the change in momentum is -4kgm/s.