A ball is thrown horizontally from a cliff such that it strikes the ground after 5s. The line of sight makes an angle 370 with the horizontal. The initial velocity of projection in ms-1 is

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1003

1002

1003

answer is D.

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Detailed Solution

Tanθ=hR,T=2 h g and R=uT and tan 370 =34 ; h=gT22=10×252=125 m Therefore u×5 ×34=125 ⇒u=1003 m/s

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