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A swimmer wishes to cross a road 500m wide which is flowing at the rate of 5km/h.His speed with respect to water is 3km/h. (a) If he heads in a direction making and angle theeta with the flow, find the time he takes to cross the river. (b) find the shortest possible time to cross the river .

A swimmer wishes to cross a road 500m wide which is flowing at the rate of 5km/h.His speed with respect to water is 3km/h. (a) If he heads in a direction making and angle theeta with the flow, find the time he takes to cross the river. (b) find the shortest possible time to cross the river .
 

Grade:12

1 Answers

Vikas TU
14149 Points
7 years ago
3 km/hr.
AS the velocity of man includes the contribution of the velocity of the water as well so velocity of water doesn’t makes sense here anyway.
t = 0.5/v
= 0.5/3sinthetha hrs. this is a part.

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