1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B

Q: what is the kinetic energy of the car at point B?

A: given  car mass= 2000kg h(i)=30m h(f)=15m kinetic energy initial KEi=0 at point B -kinetic energy…

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A: Since you have posted a question with a multiple sub parts, we will solve first three sub - parts…

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.