Question

A body with a massm is moving with a uniform velocity v. If the velocity of a body is doubled, what will be its new KE?​

Answer 1

Answer:

Here we denote work by W and force by F and displacement by s and acceleration by a.

Using third equation of motion, v

2

−u

2

=2as

∴a=

2s

(v

2

−u

2

)

We know F=ma

⟹ F=

2s

m(v

2

−u

2

)

Work done W=Fs

Thus W=

2s

m(v

2

−u

2

)s

W=

2

1

m(v

2

−u

2

).

This is the work done.