Answer:
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,
[tex]V=\sqrt{2.1^2+4.5^2} \\\\=4.96\ km/hr[/tex]
So, the velocity of the jogger relative to the ground is 4.96 km/hr.
