Alever has a mechanical advantage of 5. how large would a force need to be to lift a rock with a mass of 100kg

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, Therefore a force of 196 Newton is required to lift a rock of 100 kg with mechanical advantage 5.

power out to power in less than 100%