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InterviewSolution
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A ball is thrown vertically upwards with a velocity of 10 `ms^(-1)`. It returns to the ground with a velocity of 9 `ms^(-1)`. If g=9.8 `ms^(-2)` , then the maximum height attained by the ball is nearly (assume air resistance to be uniform)A. 5.1 mB. 4.1 mC. 4.61 mD. 5 m |
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Answer» Correct Answer - C (c ) Loss of kinetic energy `=k_(i)-K_(f)` `=(1)/(2)m(100-81)=(19)/(2)m " "(m=mass)` Half of the loss will be in upward journey. Hence, `mgh+(1)/(2)((19)/(2)m)=K_(i)=(1)/(2)m(100)=50m` `:. " " h=4.61 m` |
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