kinetic energy (K)

9 J

Speed enters squared, so K is never negative; doubling v quadruples K. 1 J = 1 kg m^2/s^2.

Steps

  1. 1.K = (1/2) m v^2 = 0.5 x 2 kg x (3 m/s)^2
  2. 2.K = 0.5 x 2 kg x 9 m^2/s^2 = 9 J

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