Q.

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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a

50

b

1003

c

1003

d

1002

answer is D.

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Detailed Solution

 tan 370 =34

T=2 h g

h=gT22=10×252=125 m

tanθ=hR, R=uT

uT tanθ=h

 u×5 ×34=125 

u=1003 m/s

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