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A Pinball Bangs Against A Bumper, Giving The Ball A Speed Of 42cm/s. If The Ball Has A Mass Of 50g, What Is The Balls Kinetic Energy In Joules? - Math Discussion

A pinball bangs against a bumper, giving the ball a speed of 42cm/s. If the ball has a mass of 50g, what is the balls kinetic energy in joules?