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Moving objects have energy. How much energy they have depends upon their mass in kilograms and their velocity in meters per second. How can you find out how much energy a moving object has? Scientists have learned that the Kinetic energy of an object can be calculated by using the following equation: KE = ½ m v2 or KE = m v v 2 This equation says that the kinetic energy can be calculated by multiplying one half the mass of the object by the square of its velocity. (The square of a number is the product of multiplying that number by itself) Read the following example in order to understand how this equation works. The mass of a golf club is 0.6 kilograms. Suppose the club is traveling 2.0 meters per second. What is the club’s Kinetic energy? 1. First write down what you know: m = mass = 0.6 kg. v = velocity = 2.0 m/sec 2. Next write the equation for Kinetic energy: KE = m v v 2 3. Then put the numbers from step 1 into the equation: Perform the calculation KE = m v v 2 KE = (0.6) (2.0) (2.0) 2 KE = (2.4) 2 KE = 1.2 Newton-meters or 1.2 Joules