To decrease the amount of time required to work without changing the total amount of work, you need to
a. increase power
b. increase distance
c. decrease power
d. decrease distance

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?