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A 5 kg mass is raised distance of 4m by ...

A 5 kg mass is raised distance of `4m` by a vertical force of 80 N. Find the final kinetic energy of the mass if it was originally at rest.`g =10 m//s^(2)`.

Text Solution

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The correct Answer is:
A, B
`W_(F) =FS cos 0^@ =80xx4xx1 =320J`
`W_(mg)=(mg)(S) cos 180^@`
`=(50)(4)(-1)`
`=-200J`
`K_(f)=W_(All)=120J`.
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