Mashaal Masha
An object's kinetic energy, in joules, is equal to the product of one-half the object's mass, in kilograms, and the square of the object's speed, in meters per second. What is the speed, in meters per second, of an object with a mass of 4 kilograms and kinetic energy of 18 joules?
Difficulty: Medium
A: 

3

B: 

6

C: 

9

D: 

36

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