JEE Main 2019 Physics question

Moment of inertia of a body about a given axis is 1.5 kg m. Initially the body is at rest. In order to produce a rotational kinetic energy of 1200 J, the angular acceleration of 20 rad/s must be applied about the axis for a duration of:

• (A)5 s
• (B)3 s
• (C)2.5 s
• (D)2 sCorrect