Question

A disc of radius 10 cm, slows down from 85 rads/s to 25 rad/s in 4 secs. What is the linear acceleration of the center of the disc, if the disc rotates about a fixed axis?

• A. Zero
• B. $1.5m/s^2$
• C. $-1.5m/s^2$
• D. $15m/s^2$

Answer 1

The correct option is D $15m/s^2$

Since the disc rotates about a fixed point, the fixed point will not move and hence its velocity and acceleration are zero, while the angular acceleration is $(85-25)/4=15rads/s^2$
Option (a) is the correct answer