1.

What will be the work done in raising the velocity of a car weighing 800 kg from 18 km/h to 54 km/h​

Answer»

Answer:

Initial Velocity, u=54km/hr=15m/s

Final velocity , v=72km/hr=20m/s

Mass =1500kg

Initial kinetic ENERGY

2

1

mu

2

2

1

1500×15×15=168750J

Final kinetic energy

2

1

MV

2

2

1

1500×20×20=300000J

So, CHANGE in kinetic energy = work done=300000−168750=131250J



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