A stone of mass 0.55 kilograms is released and falls to the ground. Measurements show that the stone has a kinetic energy of 9.8 joules at the point of impact with the ground. What is the stone's velocity when it hits the ground?
A. 6.0 meters/second
B. 7.2 meters/second
C. 8.1 meters/second
D. 9.3 meters/second
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option B is the right answer
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