A hose lying on the ground shoots a stream of water upward at an angle of 60° to the horizontal with the velocity of 16 ms-1. The height at which the water strikes the wall 8 m away is

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8.9 m

10.9 m

12.9 m

6.9 m

answer is A.

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Detailed Solution

ux=16cos60°=8 ms-1 Time taken to reach the wall =8/8=1 s Now uy=16sin60°=83 ms-1 h=83×1-12×10×1=13.86-5=8.9 m

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