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A swimmer reaches the other bank of a flowingriver exactly opposite to the starting point. If he wasswimming at 2 km/hr while maintaining 150° withthe flow, then time taken by him to cross the river1 km wide is |
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Answer» Answer: 1 hr Explanation: A swimmer reaches the other Bank of a flowing river exactly opposite to starting point if he was swimming at 2 km / he while maintaining 150° with the flow then time taken by him to cross the river 1 km wide is Swimming at 2 km/hr Angle = 150° Horizontal Speed = 2 * Cos150° = 2 * (-√3/2) = -√3 km /hr Compensated the flow ( as he reaches just opposite ) Vertical speed = 2 Sin 150° = 2 * (1/2) = 1 km/Hr Resultant Speed = 1 km/hr River Width = 1 km Time taken = 1/1 = 1 hr Correct Ans of this question:- Time taken = 1hr km/hr swimming ar 2 km/he Angle=50Horizontal speed =2* cos15°= 2*(-√3/2)= -√3km/hrcompensated the flow (as he reaches just opposite) vertical speed =2sin=150°=2 *(1/2)=1 Resultant speed =1kmRiver width = 1kmTime taken=1/1=1he |
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