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Questions  

A body is projected with an angle θ. The maximum height reached is h. If the time of flight is 4 s and g = 10 ms-2, then value of h is                                     

a
40 m
b
20 m
c
5 m
d
10 m

detailed solution

Correct option is B

As,   t=2usinθg⇒4=2usinθg                   ... (i)⇒ u sinθ = 2gand  h=u2sin2θ2g=4g22g                    [From Eq.(i)] ⇒  h = 20 m

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