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# A ball is dropped from the roof of a tall building and ISBN: 9780130606204 3

## Solution for problem 4CQ Chapter 1

Physics: Principles with Applications | 6th Edition

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Problem 4CQ

A ball is dropped from the roof of a tall building and students in a physics class are asked to sketch a motion diagram for this situation. A student submits the diagram shown in Figure Q1.4 . Is the diagram correct? Explain. Reference:? Figure 1.4:

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Solution 4CQ STEP 1:- The ball was dropped from a certain height and we know that it’s a free fall, means there is an acceleration which is downwards because of gravity. There is no other force except gravity acting on the ball. So let’s consider the equation of motion for a freely falling object, v = u + at ------------------(1) As the ball released at zero speed so u = 0, for this case. Acceleration a is “-g” the acceleration due to gravity. So, equation (1) will be modified as, v = gt----------------------------(2) The minus sign indicates that the ball is falling on the ground and not moving away from earth’s surface. Clearly it can be seen from eqn (2) that the velocity of the object...

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##### ISBN: 9780130606204

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