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a) A motorist runs out of gas on a level road 210 m from a gas...

a) A motorist runs out of gas on a level road 210 m from a gas station. The driver pushes the 1,180 kg car to the gas station. If a 160 N force is required to keep the car moving, how much work (in J) does the driver do?

b) A weight lifter raises a 175 kg barbell from the ground to a height of 1.1 m. What is the barbell's potential energy (in J)? (Calculate the potential energy relative to the ground.)

c) A personal watercraft and rider have a combined mass of 374 kg. What is their kinetic energy (in J) when they are going 12 m/s?

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