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A body projected vertically upwards with...

A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If `g = 10m//sec`, the value of u is

A

5m/sec

B

10m/sec

C

15m/sec

D

20m/sec

Text Solution

Verified by Experts

The correct Answer is:
D
Time of flight = `(2u)/(g)`
`rArr 4 = (2u)/(10) rArr u = 20m//s`
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