First slide

Periodic Motion

Question

A freely falling body takes 2 seconds to reach the ground on a planet when it is dropped from a height of 8m. If the period of a simple pendulum is 2 seconds on that planet then its length is

Easy

A

40 cm
B

50 cm
C

75 cm
D

25 cm

Solution

$T = 2 π \sqrt{\frac{l}{a}}; h = \frac{1}{2} {at}^{2}$

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