# physics

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6. You have kinetic energy when you run. If you run three times as fast, you'll have a kinetic energy ____________________.
A) 3 times as much.
B) 6 times as much.
C) 9 times as much.
D) that is the same.
E) None of these.

• physics -

replace v with 3v

KE = 1/2*m(3v)^2 = 1/2 * m * 9v^2

KE is multiplied by 9.

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