A machine with V.R4 requires 300j of work to raise a load of 300N through a vertical height of 3§2.find the efficiency

Answer 1

That is greater than 100% if you mean 3.2 meters - no way
What on earth is 3§2. ?????
I will call it h meters
then work out = 300 N * h meters = 300 h Joules
efficiency = 100 * work out/work in = 100 * 300 h / 300 = 100 h
h better be less than 1 meter