Context: There are many types of energy. One type is kinetic energy, which is the energy an object has when it is moving.
Read the passage about the start of a roller coaster ride and think about the kinetic energy of the roller coaster train.
At an amusement park, a group of riders boarded a roller coaster train and sat down.
Once everyone was safely in their seats, the ride operator flipped a switch, and electricity flowed to a motor below the track. The motor pulled the train forward and out of the station.
Which of the following is better evidence that the train's kinetic energy changed?
A. The train was stopped, and then it began to move forward and away from the station.
B. Electricity started flowing to the motor when the ride operator flipped the switch.
Choose the right answer from the options and respond with its letter.
Answer: A