$49 = \frac{2K}{v^2}$ For an object with a mass of $49$ kilograms, th…

Question

Prompt

49 = \frac{2 K}{v ^{2}}

For an object with a mass of

49

kilograms, the given equation relates the kinetic energy

K

, in joules, of the object to the object's speed

v

, in meters per second, where

K

and

v

are positive. Which equation correctly expresses this object's speed, in meters per second, in terms of the object's kinetic energy, in joules?

v = \frac{2 K}{49}

v = \frac{49}{2 K}

v = \frac{4 9 ^{2}}{2 K}

v = \frac{2 K}{4 9 ^{2}}