Question

Part G Assume that friction causes the car to lose 37,800 joules of energy as it travels from the top of the first hill to the bottom.

What's the car's velocity at the bottom of the first hill? Use your answer from part C (416,500) and the formula v= to determine the answer.

(This formula is the kinetic energy formula, rearranged to find v.) 2KE​

Answer 1

Because energy is conserved, the kinetic energy at the bottom of the first hill is the potential energy at the top of the hill, minus energy lost from friction:

KE = 416,500 J – 37,800 J = 378,700 J

To find the velocity of the car, plug the values for KE and m into the formula and solve:

The roller coaster car has a velocity of about 29.9 meters/second at the bottom of the first hill.

Step-by-step explanation:

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Answer 2

29.9 m/s

Step-by-step explanation:

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