Question

find the mass of A body which has 5 just of kinetic energy while moving at a speed of 2m/s​

Answer 1

Answer:

Correct option is

B

2.5kg

Given, kinetic energy of the body, Ek=5J;

speed of the body, v=2m/s

If m is the mass of the body, then, Ek=21mv2

or m=v22Ek=(2)22×5=2.5kg

Answer 2

kinetic energy= 1/2mv²

5 = 1/2*m*(2)²

5 = 2m

5/2 = m

2.5 kg = m