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A golf club with 65J of kinetic energy strikes a stationary golf ball with a mass of 46g. The energy transfer is only 20% efficient. Calculate the initial speed of the golf ball
kinetic energy of golf club = 65J, kinetic energy supplied to golf ball = 20% of 65 = 0.2 * 65 = 13J, kinetic energy of ball = [mass * Velocity²]/2, mass = 46gm = 0.046Kg, [0.046 * V²]/2 = 13, or 0.046 *V² = 26, V² = 26/0.046 = 565.22, V = 23.77 m/sec = initial velocity of golf ball after hitting.
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