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The bob A of a simple pendulum is releas...

The bob A of a simple pendulum is released from a horizontal position A as shownin in figure. If the length of the pendulum is 1.5m , what is the speed with which the bob arrives at the lowermost point B, given that it dissipates `5%` of its initial energy against air resistance ?

A

`3.14`

B

`5.28`

C

`1.54`

D

`8.26`

Text Solution

Verified by Experts

The correct Answer is:
B
According to the law of conservation of energy, the total energy of the system remains constant.
`95 %` of `P.E_(i) = K.E_(f)`
i.e., `(1)/(2) m v^(2) = (95)/(100) xx mgl`.
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