Q.

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

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a

550

b

450

c

600

d

750

answer is B.

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Detailed Solution

Vertical component of velocity of the object while hitting the ground is vy=0+gt  =9.8×10=98m/s So the angle made by the object with the horizontal while hitting the ground.α=tan−1(vyvx)=tan−1(9898)=450                              (∴ux=vx=98m/s)
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