Time period of a simple pendulum is T inside a lift when the lift is stationary. If the lift moves upwards with an acceleration g 2 , the time period of pendulum will be :

Step-by-step solution

When lift is stationary T = 2 π L g When lift is moving upwards ⇒ Pseudo force acts downwards ⇒ g eff = g + g 2 = 3 g 2 ⇒ New time period T ' = 2 π L g eff = 2 π 2 L 3 g T ' = 2 3 T