1.

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 :

Answer»

Nearly 3 m/s
5.5 m/s
7 m/s
9 m/s

Solution :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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