First slide

Projection Under uniform Acceleration

Question

A swimmer wishes to cross a 500-m river flowing at 5 kmh^-1. His speed with respect to water is 3 kmh^-1. The shortest possible time to cross the river is

Moderate

A

10 min
B

20 min
C

6 min
D

7.5 min

Solution

$Shortest time = \frac{d}{v} = \frac{1 / 2}{3} = \frac{1}{6} h = 10 \min$

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