Physicshard · Past Paper
A ship A is moving Westwards with a speed of 10 km/h and a ship B 100 km South of A, is moving Northwards with a speed of 10 km/h. The time after which the distance between them becomes shortest is:
A5 h
B5√2 h
C10 h
D0 h
✓ Correct Answer: A — 5 h
Using relative velocity, min distance occurs at t = (initial distance * v_rel) / (v_rel_sq). For this geometry, it is 5 hours.
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