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Q. On a very muddy football field, a 120kg linebacker tackles an 75kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.8 m/s north and the halfback is sliding with a velocity of 7.5 m/s east.

Q. you are swinging your younger sister in a circle of radius .85m. If her mass is 28kg and you arrange it so she makes one revolution every 1.5s, (a) what is the magnitude and direction of the force that must be exerted by you on her? (b) what is the magnitude and direction of the force she exerts on you?

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