Car J moves twice as fast as car K, and car J has half themass of car K. The kin

Question

Car J moves twice as fast as car K, and car J has half themass of car K. The kinetic energy of car J, compared to car Kis? a. the same b. 2 to 1 c. 4 to 1 d. 1 to 2 I believe the answer is (b) 2 to 1 since J is travelingtwice as fast. Is this correct? Car J moves twice as fast as car K, and car J has half themass of car K. The kinetic energy of car J, compared to car Kis? a. the same b. 2 to 1 c. 4 to 1 d. 1 to 2 I believe the answer is (b) 2 to 1 since J is travelingtwice as fast. Is this correct?

Explanation / Answer

Since kinetic energy is 1/2mv2 dividing half mass makes half energy, but double speed meansfour times the energy 4 times 1/2 is 2 so it's 2 to 1 dividing half mass makes half energy, but double speed meansfour times the energy 4 times 1/2 is 2 so it's 2 to 1

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