Question

Obtain an expression for kinetic energy of a body.

Answer 1

Answer:

Expression for K.E - KINETIC ENERGY-K.E = 1/2 mv2. ...

Consider a body of mass "m" starts moving from rest. ...

Using equation of motion.

2aS = Vf2 – Vi2. ...

Now force is given by. ...

Putting the value of F. ...

Since the work done is motion is called "Kinetic Energy"

Explanation:

Hope it helps you

Answer 2

Explanation:

Suppose a body of mass m is moving with velocity v. It is brought to rest by applying a retarding force F. Suppose it traverses a distance s before coming to rest. Kinetic energy of body, KE = Work done by retarding force to stop it.