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a block of weight 100 N is slowly slid u...

a block of weight 100 N is slowly slid up on a smooth incline of inclination `37^0` by as person. Calculate the work done by the person in moving the block through a distance of 2.0 m, if the drivin force is a. parallel to the inclne and b. in the horizontla direction.

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a. When force is applied parallel to incline: As block moves slowly,

`F=mgsin37^@=3/5xx10xx10=60N`
Work done, `W=vecF.vecd=F.d. cos theta`
`W=60xx2=120J`
b. When force is applied horizontally, As block moves slowly,
`Fcostheta=mgsintheta`
`F=mg tan theta=100xx3/4=75N`

Work done by F,
`W_F=F.d. cos theta`
`=75xx2xx4/5=120N`
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