Question

Upon driving onto a freeway, a 1200kg car accelerates from a velocity of 15ms^(-1) to a velocity of 35ms^(-1). Calculate the net force that is acting on the car

Answer 1

The net force that is acting on the car

$$F=ma=m\frac{v_2-v_1}{t}$$

For time $t=5\:\rm s$ we get

$$F=1200*\frac{35-15}{5}=4800\:\rm N$$