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A block of mass m slides along a frictio...

A block of mass m slides along a frictionless surfce as shown in the figure. If it is releases from rest from A what is its speed at B?

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Verified by Experts

The correct Answer is:
B

Given , `m=1kg, H=1m, h=0.8m`
Here work done by friction
`=change in P.E.
`rarr W_1=mgh-mgH `
`=1xx10xx(0.2)=-2J`
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