A car weighing 1400 kg is moving at a speed of 54 km/h up a hill when the motor stops. If it is just able to reach the destination which is at a height of 10 m above the point, calculate the work done against friction (negative of the work done by the friction).
m=1400kg,
v=54km/h=15m/sec,
h=10m
Work done =(total K.E.)-total P.E
=(12)mv2−mgh
=12×1400×(15)2−1400×9.8×10
=+157500−137200=20300 J
So, work done against friction,
W1=20300 J