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# A ball is dropped from rest from the top of a building of ## Problem 20DQ Chapter 2

University Physics | 13th Edition

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Problem 20DQ

A ball is dropped from rest from the top of a building of height ?h?. At the same instant, a second ball is projected vertically upward from ground level, such that it has zero speed when it reaches the top of the building. When the two balls pass each other, which ball has the greater speed, or do they have the same speed? Explain. Where will the two balls he when they are alongside each other: at height ?h/?2 above the ground below this height, or above this height? Explain.

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Solution 20DQ Let us have a look at the following figure. Let us assume that the two balls meet at a distance of x from the top as shown in the figure above. For the first ball, initial speed is zero. Let1v be the speed of the ball at the distance x. So, v 2 = 2gx 1 v = 2gx …..(1) 1 Let the second ball be projected with a speed of u 2 and its speed at the height h x be v 2 Therefore, v 2 = u 2 2g(h x) 2 2 v 2 = u 2 2gh + 2gx…..(2) 2 2 Now, at the top height for the 2nd ball, final...

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##### ISBN: 9780321675460

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