Q.

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

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a

55o

b

45o

c

60o

d

75o

answer is B.

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Detailed Solution

vx=ux=100 ms-1,vx=ux+ayt=0+10×10 tanθ=vyv=100100=1⇒θ=45°
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