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3. A cart at rest at the top of a roller coaster has 1000 J of
potential energy. The roller coaster goes down one hill and up
another smaller hill. If it has 400 J of potential energy at the
top of the second hill, how much kinetic energy does it have?
A)OJ B) 250 J
C) 600J
D) 1400 J E) 400000 J

Respuesta :

rainestormee

Answer:

600J

Explanation:

Assuming no energy is lost and perfect transfers.

On the top of the first hill, [tex]E_{k}+E_{p}=1000[/tex] - however there is no Kinetic Energy so - [tex]E_k = 0[/tex]

On the second hill, the total amount of energy is still the same (1000) - this time we have a smaller amount of potential energy. We can rearrange to get [tex]E_k=1000-400[/tex]

Answer:

i think C

Explanation:

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