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A ball rolls of the top of a stair way with a horizontal velocity u m s^(-1). If the steps are h metre high and b metre wide, the time taken by the ball to hit the edge of n^(th) step, is |
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Answer» `(hu)/(gb)` ALSO , `nh=1/2 g t^2 = 1/2 g XX (b^2n^2)/u^2, therefore n=(2u^2H)/(gb^2)` Time taken to travel vertical distance nh is `t=sqrt((2nh)/g)=sqrt((2h)/gxx(2u^2h)/(gb^2))=(2uh)/(gb)` |
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