Question

A train travelling at 20 m/s has 2 000 000 J of kinetic energy. What is the mass of the train?

Answer 1

Answer:

10,000 kg

Explanation:

.

Answer 2

Answer:

10,000 kg

Explanation:

The mass of the train can be found by using the formula

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

k is the kinetic energy

v is the velocity

From the question we have

$m \frac{2(2000000)}{ {20}^{2} } = \frac{4000000}{400} = \frac{40000}{4}$

We have the final answer as

10,000 kg

Hope this helps you