Solution 3 to Kinetic Energy

Question

What happens to the kinetic energy when an automobile speeds up to four times its original speed?
  1. The same
  2. Twice
  3. Thrice
  4. None above

Solution:

if the speed is now 4v instead of v, then PE = ½ m(4v)2 = 16 (½ mv2) = 16 times the original speed.


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