2. Using a giant screw, a crew does 650 J of work to drill a hole into a rock. The screw does 65 J of work. What is the efficiency of the screw? Show your
work. Hell

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m