Answers

2014-10-18T13:06:39+08:00
What is the KE of a 72kg sprinter traveling at 12m/s?
Given: m= 72kg
            V= 12m/s
Required: KE
Formula: KE= 0.5 (m)(v)^2= mv^2
                                                 2
Solution: 0.5 (72kg) (12m/s)
                = 432^2
.                     2
                = 93312 J ~ final answer
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2014-10-18T13:08:46+08:00
Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has kinetic energy. There are many forms of kinetic energy - vibrational (the energy due to vibrational motion), rotational (the energy due to rotational motion), and translational (the energy due to motion from one location to another). To keep matters simple, we will focus upon translational kinetic energy. The amount of translational kinetic energy (from here on, the phrase kinetic energy will refer to translational kinetic energy) that an object has depends upon two variables: the mass (m) of the object and the speed (v) of the object. The following equation is used to represent the kinetic energy (KE) of an object.

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