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Q.

Speed of an oblique projectile at its point of projection is twice that at its maximum height and is equal to 20 ms-1. Its time of flight is _______ (g=10m/s2)

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a

23s

b

2 s

c

23s

d

3 s

answer is A.

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Detailed Solution

Th velocity at the highest point in trajectory is given by ucosθ

cos⁡θ=12⇒θ=60∘

⇒T=2usin⁡θg=2×2010×32=23s

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