Final answer:
The net force acting on a car of 1500 kg accelerating from rest to 72 km/hr in 8.0 seconds is 3750 N. This is found by calculating the acceleration as 2.5 m/s² using the change in velocity and the time, and then applying Newton's second law.
Step-by-step explanation:
The question asks us to calculate the net force acting on a car that accelerates from rest to 72 km/hr (which is the same as 20 m/s) in 8.0 seconds. To find the force, we first need to calculate the acceleration using the formula a = ∆v / t, where a is acceleration, ∆v is the change in velocity, and t is the time taken. Since the car starts from rest, the change in velocity is 20 m/s and the time is 8.0 seconds, so the acceleration is 20 m/s divided by 8.0 s, which equals 2.5 m/s². Next, we apply Newton's second law, F = ma, where F is force, m is mass, and a is acceleration. The car's mass is 1500 kg and the acceleration we found is 2.5 m/s². The force thus equals 1500 kg multiplied by 2.5 m/s², which gives us a net force of 3750 N (Newtons).