What is the net force acting on a golf car travelling at constant speed of 5 mph 15 n 5 n 0 n 10 n

The answer is 0 Newtons

This is because of a key word in the question: “constant”

When we say something has a constant speed, that means that its acceleration is 0.

Using the equation derived for Newton’s 2nd law, we see that F=ma

Force = mass x acceleration

If acceleration, a, equals 0, then when we multiply our mass times acceleration 0

F=m(0)

Anything times zero equals zero

So, F=0