A disc rotates about its axis with a constant angular acceleration of 4 rads2. Radial acceleration of a particle at a distance of 1 cm from the axis at the end of 1 sec is
t = 1 sec, r = 1 cm = 0.01 m
α = 4 rds2
Therefore angular velocity at t= 1 second,
ω = αt = 4 rads
Therefore radial acceleration,
ac = ω2r = 0.16 ms2 = 16 cms2