Rain falls vertically downward with speed u. A man starts from rest and moves horizontally with constant acceleration a. If θ is the apparent angle of rain measured from the vertical at time t, then:
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Question

Rain falls vertically downward with speed u. A man starts from rest and moves horizontally with constant acceleration a. If θ is the apparent angle of rain measured from the vertical at time t, then:

G1 Physics · Accepted Answer

The man's horizontal speed at time t is at. Relative rain has horizontal component at and vertical component u. Therefore tanθ = (at)/u. Hence option B is correct.