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Q. On a very muddy football field, a 100 linebacker tackles an 80 halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.5 north and the halfback is sliding with a velocity of 7.2 east.

Q. A 51 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 245 N. For the first 12 m the floor is frictionless, and for the next 11.5 m the coefficient of friction is 0.17. What is the final speed of the crate after being pulled these 23.5 m?

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