Questions
A ball rolls off the top of a staircase with a horizontal velocity u ms-1. If the steps are h metre high and b metre wide, the ball will hit the edge of the nth step, if
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Correct option is C
If the ball hits the nth step, then horizontal distance traversed = nh. Here, velocity along horizontal direction =u·n=ut Initial velocity along vertical direction is 0. nh=0+12gt2∣ From t=nbv, putting t in (ii), we get nh=12 g×nbu2 or n=2hu2gb2Similar Questions
A body of mass 1 kg is moving along positive x-axis with velocity 2 m/s. At t = 0, a constant force, parallel to positive y-axis, starts acting on the body and after 5 sec, speed of the body is found to be 4 m/s. Then work done by the force in 5 sec is
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