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What is the change in velocity in the ab...

What is the change in velocity in the above question?

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The correct Answer is:
A, B, D
`Deltav = v_f - v_i`

`= (u cos alphahati - u sin alpha hatj)- (u cos alphahati + u sin alphahatj)`
`= (-2u sin alpha)hat j`
Therefore, change in velocity is `2u sin alpha` in downward direction.
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