A person is running west in Moscow at 2.1 km/hr relative to the ground and from his perspective, another person is jogging east at 4.5 km/hr. What is the velocity of the jogger
relative to the ground?

4.96 km/hr

Explanation:

Given that,

A person is running west in Moscow at 2.1 km/hr relative to the ground

Another person is jogging east at 4.5 km/hr.

We need to find the velocity of the jogger  relative to the ground. Using the concept of relative speed, let V is the required velocity. So,

So, the velocity of the jogger  relative to the ground is 4.96 km/hr.

an energy transformation flow diagram is shown

where is it ?