A (495 mathrm{~kg}) cannon fires a (10.0 mathrm{~kg}) cannonball with a speed of (211 mathrm{~m} / mathrm{s})

Question:

A $495 \mathrm{~kg}$ cannon fires a $10.0 \mathrm{~kg}$ cannonball with a speed of $211 \mathrm{~m} / \mathrm{s}$ relative to the muzzle. The cannon is on wheels that roll without friction. When the cannon fires, what is the speed of the cannonball relative to the ground?

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