You are lawn bowling and bowl a 540 g ball with a speed of 6.15 m/s. Unfortunately, your ball hits a large rock, resulting in a perfectly elastic collision. If the final velocity of the rock after the collision is 2.13 m/s, what must the mass of the rock be? a) 0.0330 kg b) 0.240 kg c) 0.540 kg d) 2.58 kg

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