physics

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which of the following is there no net work?

A car accelerates down a hill.
A car travels at constant speed on a flat road.
A car decelerates on a flat road.
A car decelerates as it travels up a hill.

I say its the first one

  • physics -

    and, you are wrong. Gravity is doing work on the car.

  • physics -

    the second one

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