A 500kg truck has 400000J of kinetic energy. How fast is it moving?
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Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.
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Answer: Kinetic energy= 1/2 mv²
400000= 1/2 x 500 x v²
v²= 400000/250
v²= 1600
v²=√1600
v= 40 m/s
So, it is moving at a velocity of 40m/s.
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