A block and tackle system of 5 pulleys is used to raise a load of 50kg through a height of 20m the work done against friction is 200J.Calculate the work done by effort,the efficiency of the system and the effort applied.

Answer 1

work done against gravity = 50*9.81 *20

total work done, add 200 J to above

efficiency = 100 * work against gravity/total work

I do not know tension in line because I do not know how your five blocks are arranged.

Answer 2

You didn’t put for effort formula