Question

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 a bike ride. think about the kinetic energy of the person riding the bike. ellen was training for a bike race. one afternoon, she grabbed her helmet and took her bike out to the street. she got on the bike and started to pedal, pushing hard to start moving forward. which of the following is better evidence that ellens kinetic energy changed? ellens speed increased when she started pedaling her bike. ellen was not touching the ground once she was on her bike.

Explanation:

Kinetic energy is related to an object's mass and velocity. When Ellen's speed (a component of velocity) increased as she pedaled, her kinetic energy changed. Not touching the ground has no direct relation to a change in kinetic energy.

Answer:

Ellen's speed increased when she started pedaling her bike.