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What is the kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s?

User SIMULATAN
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Kinetic energy = (1/2) (mass) (speed)²

= (1/2) (1.4 kg) (22.5 m/s)²

= (0.7 kg) (506.25 m²/s² )

= 354.375 kg-m²/s² = 354.375 joules .

This is just the kinetic energy associated with a 1.4-kg glob of
mass sailing through space at 22.5 m/s. In the case of a frisbee,
it's also spinning, and there's some additional kinetic energy stored
in the spin.
User Valeh Hajiyev
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