BILAL S. answered • 05/14/19

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Kinetic Energy is defined by 1/2 m v^{2}

K. Energy_{A = }1/2 * 3m * (3V)^{2. }= 1/2 x 27mV^{2}

(We can omit 1/2`s and m`s and V`s as they are present in both equations. )

K.Energy_{B = }1/2 * m * V^{2. = }1/2 mV^{2}

KE_{A} / KE_{B }= 27mV^{2}/ mV^{2. }= 27