Question

a ball of mass 200g falls from a height of 5m.what is it's kinetic energy,when it just reached the ground,also calculate the momentum of the object.​

Answer 1

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The sum of kinetic energy and potential

energy is always constant.When ball is at

the height of 5 m,

it has only potential energy which is = mgh=0.2×9.8×5 = 9.8

J(Mass in kg =0.2 kg , g=9.8)

When it reaches on ground,all its P.E

converts in K.ESo,K.E when ball reaches to ground = 9.8 J

Answer 2

Explanation:

The sum of kinetic energy and potential

energy is always constant.When ball is at

the height of 5 m,

it has only potential energy which is = mgh=0.2×9.8×5 = 9.8

J(Mass in kg =0.2 kg , g=9.8)

When it reaches on ground,all its P.E

converts in K.ESo,K.E when ball reaches to ground = 9.8 J