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Q.

A plane flying horizontally at 100 m s-1 releases an object which reaches the ground in 10 s. At what angle with horizontal it hits the ground?

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a

55∘

b

45∘

c

60∘

d

75∘

answer is B.

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Detailed Solution

vx=ux=100ms−1,vy=uy+ayt=0+10×10tan⁡θ=vyvx=100100=1 ⇒ θ=45∘
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