Manipal Entrance Test 2013 Physics Paper

Work done against frictional force equals the kineticenergy of the body.
when a body of mass m, moves with velocity v, it has kinetic energy k=

1

2

mv2 this energy is utilized in doing work against the frictional force between the tyres of the car and road.
∴ kinetic energy = work done against friction force

1

2

m2=µ mgs
where s is the distance in which the car is stopped and µ is coefficient kinetic friction .
Given v=v0
s=

v0

2µg