2.The sandalone.The weightof the sandis decreasingat a constantrate from N to N over the
-meterlift. Whenthe bucketis at metersabovethe floor, the sandweighs
The graphof representsthe variationof the forcewith height (Figure23). The work
donecorrespondsto computingthe area underthe forcegraph.
Figure 23
Thusthe workdoneis