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.
