cal Energy and Speed Unit Test

Question

6 of 86 of 8 Items
Question
A car that is moving fast at the bottom of an uphill ramp moves up the ramp, slows down and stops just for an instant, and then begins to roll back down the ramp. At which point does the car have the most potential energy and why?(1 point)
Responses

The potential energy remains the same throughout. This is because energy is always conserved.
The potential energy remains the same throughout. This is because energy is always conserved.

At the point where the car is moving the fastest at the bottom of the ramp. This is because the faster an object is moving, the larger its potential energy.
At the point where the car is moving the fastest at the bottom of the ramp. This is because the faster an object is moving, the larger its potential energy.

At the point when the car is stopped. This is because its kinetic energy is zero at this point, which means all of its energy is in the form of potential energy.
At the point when the car is stopped. This is because its kinetic energy is zero at this point, which means all of its energy is in the form of potential energy.

At a point directly in the middle between the bottom and when the car stops. This is because this is the perfect balance point between kinetic energy and potential energy.

Answer 1

The correct response is:

At the point when the car is stopped. This is because its kinetic energy is zero at this point, which means all of its energy is in the form of potential energy.

Explanation: When the car reaches the highest point on the ramp and comes to a stop momentarily, all of the kinetic energy it had while moving has been converted to potential energy. At this point, kinetic energy is zero (since the car is not moving), and the potential energy is at its maximum due to the car being at the highest height relative to the bottom of the ramp.