Question

The expression for kinetic Energy K.E. is :

• A. K.E = mgh
• B. K. E = $\frac{1}{2}m{v}^2$
• C. K. E = $\frac{1}{2}m{v}^3$
• D. K. E = $\frac{1}{2}{m}^{2}v$

Answer 1

The correct option is B

K. E = $\frac{1}{2}m{v}^2$

Kinetic energy of a body is the energy possessed by its due to its motion.

Kinetic energy K.E (or K ) = $\frac{1}{2}m{v}^2$.

It depends on two factors :

(i) On the mass of the body:

Greater the mass of the body, greater is its kinetic energy.

(ii) On the speed of the body:

More the speed of the body, higher is its kinetic energy.