what is the work done to increase the velocity of a car from 36 km to 72 km if the mass of the car is 1500 kg ? does the work done by the force have a negative or a positive magnitude
Answers
Answer:
2,25,000J
Explanation:
Given,
Initial velocity 'u' = 36 km/h
Final velocity 'v' = 72 km/h
Mass of car 'm' = 1500 Kg.
To find,
Work done to increase the velocity of a car from 36 km/h to 72 km/h if the mass of the car is 1500 kg.
Solution,
We can simply solve the above numerical by using the concept that
Work done to increase the velocity = change in kinetic Energy
Initial velocity 'u' = 36 km/h
= 36*1000/1800
= 10 m/s
Final velocity 'v' = 72 km/h
= 72*1000/1800
= 20 m/s
Work done = change in kinetic energy
= 1/2 m(v²-u²)
= 1/2*1500*(400-100)
= 225000 Joule
Hence, the work done to increase the velocity of a car from 36 km/h to 72 km/h, if the mass of the car is 1500 kg is 225000 Joule.