Question

A body in equilibrium will not have –

• A. Velocity
• B. Momentum
• C. Acceleration
• D. All of the above

Answer 1

Answer: (C)

Acceleration

Answer 2

At the initial moment, angular velocity of rod is zero. Acceleration of end B of rod with respect to end A is shown in figure. Centripetal acceleration of point B with respect to A is zero ( ² = 0)

So at the initial moment, acceleration of end B with respect to end A is perpendicular to the rod which is equal to $\sqrt{a^{2} + b^{2}}$

a_rel = 

$\frac{\sqrt{a^{2} + b^{2}}}{\mathcal{l}}$ =  where  is angular acceleration