Questions
A ball rolls of the top of a stair way with a horizontal velocity u m/s. If the steps are h metre high and b metre wide, the ball will hit the edge of the nth step, if
detailed solution
Correct option is B
The situation is shown in fig. (1)If the ball hits the nth step, then horizontal distance traversed = nb vertical distance traversed = nhHere, velocity along horizontal direction = u velocity along vertical direction = 0∴ nb=ut and nh=0+12gt2 or t=nbu and nh=12g×nbu2∴ n=2hu2gb2Talk to our academic expert!
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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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