Originally Posted by

**Natasha1** Any help with this would be most appreciated. Thanks in advance

The EMF (Effective Motive Force) for a car is the engine driving force minus friction and air resistance.

a)A car of mass 1000Kg travels from rest with constant acceleration to 25 m/s in 30 seconds. Use the impulse-momentum relationship to find the EMF?

b)Now suppose that instead the EMF is made by the driver to increase uniformly during the 30 seconds (by gradually increasing foot pressure on the accelerator). Use the impulse-momentum relationship to find the final speed reached?

c)Compare a) and b)?