Final answer:
The net force on a 10.0 kg body in Earth's gravitational field is 98.0 N downward, calculated using the formula w = mg.
Step-by-step explanation:
The question is asking us to calculate the net force acting on a body with a mass of 10.0 kg that is in Earth's gravitational field where the acceleration due to gravity is 9.80 m/s2.
Using the formula for weight (which is the gravitational force on a mass), w = mg, where m is the mass and g is the acceleration due to gravity, we find that:
w = (10.0 kg)(9.80 m/s2) = 98.0 N.
Therefore, if there are no other external forces acting on the object, the net force on the body is 98.0 N directed downward due to gravity. This corresponds to answer choice (c).