Question

The engine weighs 4500 newtons and it is lifted 1.5 meters up by the block and tackle system. The mechanic must apply a force of 225 newtons while pulling a total of 37.5 meters of chain through the block and tackle pulley system. What is the work done by the block and tackle system?

Answer 1

mechanic: 225N*37.5m=work done by mechanic
engine:4500*1.5 Joules work done

so, work done by block/pulley is the secondline, the work done on the engine.

Answer 2

76.6%