Posted by **James** on Wednesday, May 23, 2012 at 3:41pm.

7. Two cars are moving. The first car has twice the mass of the second car, but only half as much kinetic energy. Then, both cars increase their speed by 8.00 m/s. They then have the same kinetic energy. The original speeds of the two cars are, respectively,

A. v1 = 5.66 m/s, v2 = 11.3 m/s.

B. v1 = 14.1 m/s, v2 = 7.07 m/s.

C. v1 = 11.3 m/s, v2 = 5.66 m/s.

D. v1 = 22.6 m/s, v2 = 11.3 m/s.

E. v1 = 14.1 m/s, v2 = 22.6 m/s.

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