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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