Question

what must be the velocity of a moving body of mass 2kg , so that it's K.E. is 25 J ?

Class 9​

Answer 1

Answer:

The velocity of a moving body is 5 m/s.

Explanation:

Given,

Kinetic energy (KE) = 25 J

Mass (m) = 2 kg

We know that,

Kinetic energy (KE) =1/2 mv²

25 = 1/2 * 2 * v²

v² = 25

v = √25

v = 5 m/s  

Answer 2

Explanation:

1/2×2×(x)²=25

or,x²=25

or,√x²=√25

or,x=5

velocity=5m/s