Rahul was not listening to his friend as he was playing cricket, his friend got irritated and dropped the ball of 200g from roof top i.e. a height of 10m. The kinetic energy found when it reaches the ground is-

10.5 J

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25.2 J

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16.9 J

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19.6 J

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Solution

The correct option is D
19.6 J

Using the equation of motion v²=u²+2as,

u =0m/s ; s = 10m

So v²= 0 + 2 x 9.8 x 10, = 196

v is the speed with which the body hits the ground.

To find the kinetic energy of the body when it reaches the ground:

m = 200g = 0.2kg

KE = 1/2 mv²= 1/2 x 0.2 x 196=19.6 J

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Rahul was not listening to his friend as he was playing cricket, his friend got irritated and dropped the ball of 200g from roof top i.e. a height of 10m. The kinetic energy found when it reaches the ground is-

The correct option is D 19.6 J Using the equation of motion v2=u2+2as, u =0m/s ; s = 10m So v2= 0 + 2 x 9.8 x 10, = 196 v is the speed with which the body hits the ground. To find the kinetic energy of the body when it reaches the ground: m = 200g = 0.2kg KE = 1/2 mv2= 1/2 x 0.2 x 196=19.6 J