COMEDK Exam 2016 Solved Paper

The time period of a pendulum is given by
T=‌

1

2π

√‌

l

g

When a lift containing a simple pendulum is accelerated upwards with acceleration a, then its time period becomes
T′=‌

1

2π

√‌

l

(g+a)

Clearly, ‌‌T′∠T
Hence, its time period decreases.