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Q.

A body is projected horizontally from the top of a tower, when the body hits the ground its velocity is 120m/s and direction of motion makes angle 300 with the vertical. Then its projection velocity is

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a

60 m/s

b

120 m/s

c

603 m/s

d

2403 m/s

answer is A.

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Detailed Solution

given final velocity=v =120 m/s;angle made by v with horizontal=θ=900-300=600  horizontal projected initial velocity =U=Vx=Vcosθ=Vcos900-300= constant substitute, V=120 m/s ∴U=120×12 =60 m/s
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