Question

What is the weight of the earth of a running basketball players with mass of 100 kg

Answer 1

By definition, if a body doesn't have an acceleration in vertical direction, its weight is given as follows:

$$P = mg$$

where $m = 100kg$ is the mass of the body, and $g = 9.81m/s^2$ is the gravitational acceleration of the Earth. Thus, obtain:

$$P = 100kg\cdot 9.81m/s^2 = 981N$$

Answer. 981 N.