One 110-kg football lineman is running to the right at 2.75 m/s while another 125-kg lineman is

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One 110-kg football lineman is running to the right at 2.75 m/s while another 125-kg lineman is running directly toward him at 2.60 m/s. What are?
(a) The magnitude and direction of the net momentum of these two athletes, and
(b) Their total kinetic energy?
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