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Crazy boy [7]
3 years ago
9

Determine the amount of work you would need to do in order to stop a 1100kg car with 1400J of kinetic energy.

Physics
1 answer:
LiRa [457]3 years ago
6 0

Answer:

 W = -1400 J

Explanation:

Let's use the relationship between work and kinetic energy

           W = ΔK

             

kinetic energy is

            K = ½ m v²

therefore in this case

             K₀ = 1400 J

         

Thus

            W = 0 -1400

            W = -1400 J

The negative sign indicates that the work is done against the energy, that is, in the opposite direction to the movement

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