Abullet whose mass is 30.2 g leaves a rifle with a muzzle velocity of 1,000 m/s. it strikes a block of wood (mass 5 kg), initially at rest, and remains embedded in it. after the bullet hits the block, what will be the velocity of the bullet-block system?

a. 30.2
b. 1.51
c. 33.1
d. 165
e. 6
f. 7.6
g. 6,000

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.