1.

A ball has been dropped from a height of 100 metres, another ball thrown up with a speed 25m/s from ground at same time. find after what time they will cross each other.

Answer»

here, height is 100m.now the two ball meet at point p which is at a height x above the ground so that the distance of point p from the top is 100-x(1) for the ball falling from topheight=(100-x)minitial velocity=0



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