Question

A horse of mass 210kg and a dog of mass 25kg are running at the same speed.which of the two possess more Kinetic energy and how?

Answer 1

Ans: Horse will possess more kinetic energy.

Explanation:
K.E = 0.5mv²
For same speed (v)
K.E ∝ m

So, from above expression heavier the object more is the kinetic energy.

Answer 2

The horse will posses more kinetic energy.

It is given that a horse of mass 210kg and a dog of mass 25kg are running at the same speed.

We can see that the mass of the horse is greater than the mass of the dog.

Now, we will look at the formula for kinetic energy

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

We can see that the kinetic energy is directly proportional to the velocity and the mass.

So when the dog and the horse with the same velocity are running the kinetic energy of the horse will be more than that of the dog because the mass of the horse is greater.