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A metre stick held vertically with one e...

A metre stick held vertically with one end on the floor is allowed to fall. Speed of the other end when it hits the floor is :

A

Nearly 3 m/s

B

5.5 m/s

C

7 m/s

D

9 m/s

Text Solution

Verified by Experts

The correct Answer is:
B
Here P.E. = K.E. of rotation
`mg((l)/(2))=(1)/(2)Iomega^(2)=(1)/(2).(1)/(3)ml^(2)omega^(2)`
`=mgl=(1)/(3)mv^(2)" "[therefore v=lomega]`
`therefore v=sqrt(3gl)=sqrt(3xx10xx1)=5.5m//s`
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