Question

The K.E of a body can be increased most by doubling its:

• A. mass
• B. weight
• C. speed
• D. density

Answer 1

Answer: (C)

speed

Kinetic energy of a body is given by

$KE=\frac{m{v}^2}{2}$

If velocity is doubled:

So $K{E}_{final}=\frac{m(2v{)}^2}{2}=\frac{4m{v}^2}{2}=4KE$

If we double mass ,KE will become double.

So doubling velocity will increase KE by 4 times .