A rotatable platform begins from rest and accelerates at 2.0 rad/s² for 4.0 s
PHYSICS · Subjective · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A rotatable platform begins from rest and accelerates at 2.0 rad/s² for 4.0 s. Immediately afterward it decelerates at a constant (and unknown) angular acceleration until it comes to rest, turning through an additional 30 rad during this deceleration. Determine (i) the magnitude of the angular acceleration during the deceleration phase and (ii) the time required for the platform to come to rest.