# When the speed of a moving object is doubled, its :A. acceleration is doubledB. weight is doubledC. kinetic energy is doubledD. kinetic energy increases 4 times

Kinetic energy KE of a body of mass m moving with velocity or speed v is given by the formula:

KE1 = mv12

If the speed of particle is doubled then

KE2 = mv22 where, v2 =v1

Substituting the value of v2 in the formula,

KE2 = m (2v1)2

= (4 mv12)

KE2 = 4 KE1

So kinetic energy will become 4 times if the speed is doubled.

On other hand, acceleration depends on final as well as initial velocity, and here acceleration will be same.

Weight is independent of change in speed.

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