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1200kg car speeds up from 2 m/s to 6 m/s. How many times greater is the car's kinetic energy at the higher speed compared to the kinetic energy at the slower speed?
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14 votes
1200kg car speeds up from 2 m/s to 6 m/s. How many times greater is the car's kinetic

energy at the higher speed compared to the kinetic energy at the slower speed?

User Tushar Korde
by
3.6k points

1 Answer

10 votes

Answer:

9 times as great

Step-by-step explanation:

KE = 1/2mv²

  1. 1/2(1200)(2)² = 2,400 J
  2. 1/2(1200)(6)² = 21,600 J

21,600 / 2,400 = 9

User Vallo
by
4.0k points
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