A stage crew member uses a pulley system to lift scenery for the school play. If he does 850 J of work and the pulley system does 710 J of work, what is the efficiency of the pully system?

Football was the fourth deadliest sport with a fatality rate of .81 per 100,000 participants. cheerleading, which has been shown to be the most dangerous activity based on injury data, was not included in the study because it was not classified as a sport.this is my answer because it didn’t give me any sports

Iagree c would be the answer

//(b) both involve the use of levers;