Question

The velocity of a car increases from 54 km/hr to 72km/hr How much is the work done if the mass of the car is 1500kg?​

Answer 1

Answer:

131250J

Step-by-step explanation:

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