Physics, 21.02.2020 05:17, log40

A halfback on an apparent breakaway for a touchdown is tackled from behind. If the halfback has a mass of 98 kg and was moving at 4.2 m/s when he was tackled by an 85 kg cornerback running at 5.5 m/s in the same direction, what was their mutual speed immediately after the touchdown-saving tackle? m/s

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A halfback on an apparent breakaway for a touchdown is tackled from behind. If the halfback has a ma...