Q10Short answer
A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies?
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Initial velocity = v, then v ′ = 3 v Initial kinetic energy = m v2 1 1 1 Final kinetic energy (K.E.) = m v ′ 2 = m (3 v )2 = 9 ( m v 2 ) 2 2 2 (K.E) initial : (K.E) final = 1:9