Answer:
196 Newton force is needed to lift a rock.
Explanation:
We know a formula, Mechanical advantage × effort applied = Load lifted. In this question, mechanical advantage of lever = 5 Load lifted = Mass of the rock × acceleration due to gravity = 100 × 9.8 = 980N so, putting the given values in the formula, [tex]\text { Force }=\frac{\text { Load lifted }}{\text { Mechanical advantage }} \text { Force }=\frac{980}{5}=196 \text { Newton. }[/tex] Therefore a force of 196 Newton is required to lift a rock of 100 kg with mechanical advantage 5.
