At a dragster race, two cars compete on a 1/4 mile straight track and start from rest (1 mile=1609m) One car covers this distance in 4.00 s and then releases a parachute that causes it to slow down with an acceleration of 15 m/s² [Backwards]. The mass of a drag racer including a driver is 1057 kg.

a) Determine the acceleration of the car over the first 1/4 mile.

b) Determine the force of friction between the wheel and the pavement as the car speeds up.

c) Determine the minimum possible coefficient of friction between the tires and the road.