Question

If the speed of an object in motion is doubled, its kinetic energy becomes how many times the original kinetic energy

Answer 1

Answer: Becomes four times

Explanation:

Given

Speed is doubled for a moving object

Suppose initial speed is u

Increased speed is 2u

Kinetic Energy is given by

`\Rightarrow K=0.5mu^2`

When speed is doubled

`\Rightarrow K'=0.5m(2u)^2\\\Rightarrow K'=(0.5mu^2)* 4\\\Rightarrow K'=4K`

Kinetic energy becomes four times