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Question

# A ball of mass 3 kg is thrown upwards with a speed of 10 m/s. When the ball reaches the highest point, the work done on it by the gravity will be

A
300 J
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B
-150 J
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C
-300 J
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D
150 J
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Solution

## The correct option is B -150 JGiven, Mass of the ball, m = 3 kg Initial velocity, u = 10 m/s At the highest point, the velocity of the ball will be zero. So, final velocity, v = 0 m/s We know that, v2=u2+2as 0=102−2∗10∗s s=1002∗10 s=5m So, work done by gravity = Force x Displacement = mgh = 3 x -10 x 5 = -150 J

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