how much is the net force required to accelerate 1000kg of a car in 5mins/sec?

Answer 1

If you provide the acceleration rate (a) in m/s^2 units, the force is
F = M a.

F is the force in Newtons and M is the mass in kg.

5 min/sec is not an acceleration rate. It is an incorrect time conversion factor.

5 meters/sec^2 IS an accleration rate.

These are things you should know if you are studying mechanical engineering.