Question

A body moving with a velocity 5m/s having mass 4kg stopped by some force, what will be the final

Kinetic energy?

(a) 50J

(b) 0J

(c) 25J

(d) 125J

​

Answer 1

Answer:

Answer is 0 J of the question

Answer 2

Mass of the body = 4 kg

Final velocity = 0 m/s

We know,

KE = ½ mv^2

So, KE = ½ (4 kg)(0 m/s^2)

⇒ KE = 0 J (b)

∴ Option (b) is correct here.

More:

The law of conservation of energy states that the total energy of a system remains conserved.

That is, KE + PE = Constant.

And, KE = p^2/2m.