Which object has the greatest kinetic energy?(1 point)
Responses
a green car with a mass of 500kg moving at 21 m/s
a green car with a mass of 500kg moving at 21 m/s
a red car mass of 500 kg moving at 3 m/s
a red car mass of 500 kg moving at 3 m/s
a blue car with a mass of 500 kg moving at 30 m/s
a blue car with a mass of 500 kg moving at 30 m/s
a yellow car with a mass of 500 kg moving at 12 m/s
a blue car with a mass of 500 kg moving at 30 m/s
A wildlife keeper is trying to catch an escaping rabbit. Who has the greater kinetic energy, the rabbit or the wildlife keeper?
(1 point)
Responses
The wildlife keeper because they have a greater mass.
The wildlife keeper because they have a greater mass.
The rabbit because it has less mass.
The rabbit because it has less mass.
The wildlife keeper because they speed up and catch the rabbit.
The wildlife keeper because they speed up and catch the rabbit.
Neither one because they are moving at the same speed.
The rabbit because it has less mass.
A skydiver jumps out of a plane and begins to accelerate. His speed increases to 20 m/s, then 30 m/s. His acceleration slows until he reaches a constant speed of 50 m/s. Which statement accurately describes his kinetic energy while falling?(1 point)
Responses
His kinetic energy increased while his speed increases, then it became constant.
His kinetic energy increased while his speed increases, then it became constant.
His kinetic energy increased quickly at first, then it increased at a constant rate.
His kinetic energy increased quickly at first, then it increased at a constant rate.
His kinetic energy would remain the same for the whole fall as long as he lost no mass.
His kinetic energy would remain the same for the whole fall as long as he lost no mass.
His kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.
His kinetic energy increased while his speed increases, then it became constant.
The girl in the picture is at the highest point in swinging and starts to come down. Which statement best describes the changes in energy as she begins to descend?
(1 point)
Responses
Potential energy is increasing, and kinetic energy is decreasing.
Potential energy is increasing, and kinetic energy is decreasing.
Kinetic energy is increasing, and potential energy is decreasing.
Kinetic energy is increasing, and potential energy is decreasing.
Kinetic and potential energy are decreasing.
Kinetic and potential energy are decreasing.
Kinetic and potential energy are increasing.
Potential energy is increasing, and kinetic energy is decreasing.
A person is riding a skateboard on a U-shaped ramp. At which point does the person have the greatest potential energy?(1 point)
Responses
on the other side of the ramp as the person is coming back up
on the other side of the ramp as the person is coming back up
on the first part of the ramp as the person is moving down the side
on the first part of the ramp as the person is moving down the side
at the top of the ramp before they begin moving down into the ramp
at the top of the ramp before they begin moving down into the ramp
in the middle of the ramp at its lowest point in the U