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JEE Main 2017 · Motion Under Gravity

Motion Under Gravity question from JEE Main 2017

Q45JEE Main 2017Easy

Motion Under Gravity

A body is thrown vertically upwards. Which one of the following graphs correctly represent the velocity vs time?

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Answer: (d)

Upward positive: $v = u - gt$ , a straight line of constant slope $-g$ .
It starts at $+u$ , passes through $v = 0$ at the highest point and continues to negative values on the way down, without any change of slope.
Graphs (a), (b) and (c) change slope or direction, which would need a change in acceleration.
So the answer is (d).

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