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Question

If the speed of an object doubles, its kinetic energy becomes


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Solution

Step 1. Kinetic energy:

It may be defined as the energy, which a body possesses by virtue of its motion.

Speed:

Distance covered in a unit of time is known as speed. Generally, it is expressed in ms.

Step 2. Formula used:

Kinetic energy may be given by:

KE=12mv2, where m= mass, v= speed.

Step 3. Calculations:

If we double the speed, v'=2v

Then, KE'=12m2v2=412mv2=4.KE,

Hence, the kinetic energy will become 4 times the initial kinetic energy.


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