Question

A horse and a dog are running at a same speed . The mass of horse $12$ times of mass of dog. Find out ratio of their kinetic energies.

• A. $1:5$
• B. $1:12$
• C. $12:1$
• D. $1:6$

Answer 1

The correct option is C $12:1$



The kinetic energy of a moving object is given by: $\frac{1}{2}m{v}^2$.
Therefore, if the mass of horse $12$ times the mass of dog, then the kinetic energy of the horse will be $12$ times the kinetic energy of the dog.
Hence, the ratio of the kinetic energies of the horse and the dog is 12:1.