A workman uses a crowbar to lift a manhole cover. The distance from the end of the crowbar where the workman pushes the crowbar downwards to the pivot is 0.90m. The distance from the pivot to the end of the crowbar where it lifts the manhole cover is 0.05m. Force needed to lift the edge of the manhole cover is 900N.

Answer 1

90:5 mechanical advantage

50N downward push