To a man running at 25 m s⁻¹, vertically falling rain appears at 45° from the vertical. The actual speed of rain is:
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Question

To a man running at 25 m s⁻¹, vertically falling rain appears at 45° from the vertical. The actual speed of rain is:

G1 Physics · Accepted Answer

Rain is actually vertical. The man's horizontal speed is 25 m s⁻¹, which is the horizontal component of apparent rain. At 45° from the vertical, horizontal and vertical components of apparent rain are equal. Therefore the true vertical rain speed is 25 m s⁻¹. Hence option A.