Q.

A plane is flying horizontally at 98 m/s and releases an object which reaches the ground in 10 sec. The angle made by object while hitting the ground is :

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a

55°

b

45°

c

60°

d

75°

answer is B.

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Detailed Solution

Horizontal component of velocity of objectVH=98 m/sAnd vertical component vv=0+gt =9.8×10=98 m/s as VH=vvso angle made by object while hitting the ground = 450tanθ=vvvH=1⇒θ=45°
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