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A block of mass 1.2 kg moving at a speed of 20 cm/s collides head on with a similar block | keptat rest, the coefficient of restitution is 3/5, the loss of kinetic energy during the collision is:
$$6.7 \times 10^{-3}$$ joule
$$7.7 \times 10^{-3}$$ joule
$$8.7 \times 10^{-3}$$ joule
$$17.7 \times 10^{-3}$$ joule
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