1
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Question

# A body is projected horizontally from the top of tower. when the body strikes the ground its velocity is V and the direction of motion makes 30o with the horizontal. the velocity of projection is:

A
3v2
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B
v3
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C
v2
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D
2v3
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Solution

## The correct option is A √3v2The vertical component of the initial velocity say uy=0The horizontal component of the initial velocity is ux.Given: The body strikes the ground with Vm/sAs given it strikes at an angle 30∘,According to question;Vcos30∘=ux;=ux=V×√32=ux=√32VThe required velocity of projection is =ux=√32VOption (A) is correct.

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