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The stone, which has a mass of 0.16 kg, slides across the horizontal
frozen pond. When it has a speed 2.0 m s-¹ it hits a lump of ice
which is initially at rest, and the two join together without loss of
mass. The ice and stone combined continue in the stone's direction
of travel with a speed of 0.81 m s-¹.
(i) Calculate the mass of the lump of ice.
(ii) Is the collision elastic or inelastic? Explain your answer.

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