Question

The picture below shows a toy car in the process of rolling down a ramp. At point X, the kinetic energy is 50 Joules (J), and the potential energy is 30 J.

What is the total energy in the system once the car reaches the bottom of the ramp?
A
20 J, because the energy in the system cannot change form but can be created and destroyed

B
80 J, because the energy in the system can change form but cannot be created or destroyed

C
30 J, because the potential energy is the only energy at the bottom of the ramp

D
50 J, because the kinetic energy is the only energy at the bottom of the ramp

Answer 1

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Step-by-step explanation:

Answer 2

B 80 J, because the energy in the system can change form but cannot be created or destroyed

Step-by-step explanation:

According to the law of conservation of energy, the total energy stays the same. The car starts with a total of 80 J of energy, so it must also end with a total of 80 J of energy.