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Question

# A ball is thrown vertically upwards with a velocity 'u'. The velocity with which it falls to the earth again is:

A

Less than 'u'

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B

Greater than or equal to 'u'

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C

Equal to 'u'

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D

Greater than 'u'

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Solution

## The correct option is C Equal to 'u' For vertically upward motion: g is negative as it opposes the motion. v = u - gt 0 = u - gt t = u/g .....(1) For vertically downward motion: g is positive as it is in the direction of motion. v = u + gt v = 0 + gt t = v/g .....(2) From equation 1 and 2 v = u

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