Question

Give reasons for the following:

'A horse has more kinetic energy than a dog running at the same speed.'

Answer 1

1. We know, $\mathrm{Kinetic}\mathrm{energy}=\frac{1}{2}\mathrm{x}\mathrm{m}\mathrm{x}{\mathrm{v}}^2$
2. From the above formula we see that mass is directly proportional to K.E
3. When a horse and a dog are running at the same speed.
4. The body which is having more mass will have more kinetic energy.
5. In this case, the horse has more mass than a dog, hence, the kinetic energy of a horse is more than the kinetic energy of a dog.