Sally is riding her skateboard at 12.0 ft/s and passes under an apple tree. As
she moves past, she grabs a 2.0 kg branch with five apples right off the tree.
Sally's mass is 34 kg. What is her speed after grabbing the branch and apples?

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.