Question

a body having mass 10 kg revolving around its axis of rotation 5cm with angular speed 5 per second. calculate kinetic energy of body​

Answer 1

Mass of body, m = 10 kg

Radius , r = 5 cm = 0.05 m

Since it is not given in the question that whether the body is ring or other.

Hence, I am assuming it a ring.

Angular speed, ω = 5 rad/sec

hence, KE = 1*I*ω^2/2

                 = m*r^2*ω^2/2

                 = 10*(0.05)^2*5^2/2 = 0.3125 J