What is net force

Question

Starting from rest, a 750 kg car accelerates to 60 mph in 2.5 seconds. What is the net force exerted on the car by the engine

Answer 1

First, write down what is given.

 

v_i = 0 m/s

v_F = 60 mph = 96560.40 m / 3600 s = 26.83 m/s

t = 2.5 s

 

Next, we need to find the acceleration, a.

 

a = (v_F - v_i) / t

a = (26.82 m/s) / (2.5 s)

a = 10.73 m/s²

 

Now we use the formula for force.

 

F = ma

F = 750 kg * 10.73 m/s²

F = 8047.50 N