Q: A spring of spring constant 200 N/m has a block of mass 1 kg hanging at its one end and other end of spring is attached to ceiling of an elevator. The elevator is rising upwards with an acceleration g/3. What should be the angular frequency and elongation during the time when the elevator is accelerating ?

(a) 14.14 rad/s, 0.07 m

(b) 13 rad/s, 0.1 m

(c) 14 rad/s, 0.05 m

(d) 10 rad/s, 0.07 m

Ans: (a)