The angular speed can't be determined without knowing the rotational inertia of the disk. The correct option is D.
It is the quantitative measure of the inertia when a body is rotating.
Given, radius of disk R= 0.5 m, Force F=2N, then torque developed will be
τ = F x R = 2 x 0.5 =1N..m
If m is the mass of disk, the rotational moment of inertia about center of disk is
I = mR²/2 = m(0.5)²/2 = m/8 kg.m²
The angular acceleration is α =τ/I = 1/(m/8) =8/m
Angular velocity ω =ω₀ +αt = 0+(8/m) x 1 =8/m rad/s
Thus, the correct option is D.
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