A car of mass m starts from rest and acquires a velocity along east v = v\(\widehat i\) (v > 0) in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is
1
\(\frac{mv}{2}\) eastward and is exerted by the car engine.
2
\(\frac{mv}{2}\) eastward and is due to the friction on the tyres exerted by
3
more than \(\frac{mv}{2}\) eastward exerted due to the engine and overcomes the friction of the road.
4
\(\frac{mv}{2}\) exerted by the engine .