A ball is rolling down a hill. At the bottom of the hill, its traveling at 15 m/s. The ball has a mass of 10 kg. What is the kinetic energy of the ball at the bottom of the hill? a) 150 J
b) 2250 J
c) 1125 J
d) 300 J

Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

Recommend a strategy for incorporating sustainable human activity into a tropical rain forest biome.

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.