A woman wants to lift a heavy sack of food on a table. It weighs 90kg. The tabletop is 1.0m from the floor. The woman wedges a plank against the table and successfully
pushes the sack up a sloping plank. If the plank is 3.0m long; Calculate:
(i) The energy needed to lift the sack onto the table.
(ii) The effort she must use to push the sack up the plank, assuming that there is no
friction. (Assume that 1.0kg exerts a downward force of 10N).
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