In the case when the forces act on the car as shown in the picture so here the net force should be 3N. Calculation of the net force: Since A parachute in the back of the car is released to help slow down the car. So here the net force should be = 10 N- 7N = 3 N Hence, In the case when the forces act on the car as shown in the picture so here the net force should be 3N.
