Solve the following examples:
The velocity of a car increases from `54 km//h` to `72 km//h`. If the mass of the car is 1500 kg, find the work done to increase the velocity.

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

The velocity of a car increase from 54 km/ hr to 75 km/hr. How much is the work done if the mass of the car is 1500 kg ?

The velocity of a car increases from 15 (km)/h to 33 (km)/h in 20 s. Find its acceleration.

The velocity of a car decreases from 43 (km)/h to 25 (km)/h in 10 s. Find its retardation.

In a certain time interval, the velocity of a car reduces from 72 km/h to 36 km/h. If the car covers a distance of 150 m during this time interval, find the retardation of the car.

Solve the following examples: A body of mass 1 kg has kinetic energy 2 J. Find the velocity of the body.

A train approaching a station reduces its speed from 180 km/hr to 90 km/hr. If the mass of the train is about 20,000 kg then how much is the work done by the train?

Solve the following examples: Ajit carries a load of 17 kg from the ground to the height of 2 m from the ground. Calculate the work done by him.

The speed of a body of mass 4 kg increases from 2m//s to 4 m//s in certain time interval. Find the increase in the kinetic energy of the body.

Solve the following examples / numerical problems: The mass of a planet is 3 times the mass of the earth. Its diameter is 25600 km and the earth's diameter is 12800km. Find the acceleration due to gravity at the surface of the planet. [g (earth)=9.8 m/s^2]