A person lift a wooden case of mass 64kg through a vertical height of 1.5m.
a)Calculate the work done on the case.
b)If the person used an inclined plane with an efficiency of 75% to raise the case through the same height,find the amount of work he would then do.
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Given: mass of the load(m)=20kg, displacement(or)height (s)=1.5m.
Work done(W)= Force(F)*Displacement(s)
force=ma=mg (acceleration due to gravity)
W=Fs=mgh
=20×9.8×1 .5
=294Nm (or) 294J
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