A man walks at 5 km h⁻¹. Rain is actually falling vertically downward and appears to him at 45° to the horizontal. The speed of rain is:
Options

Question

A man walks at 5 km h⁻¹. Rain is actually falling vertically downward and appears to him at 45° to the horizontal. The speed of rain is:

G1 Physics · Accepted Answer

Rain is actually vertical. In the man's frame, the horizontal relative component equals 5 km h⁻¹. Since apparent rain makes 45° with the horizontal, the vertical component is also 5 km h⁻¹. Therefore true rain speed is 5 km h⁻¹. Hence option A.