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Q. A 6-kg block slides along a frictionless horizontal surface. The block is acted on by two forces, a 4.5 N force to the left, and a 7.5N force to the right. At what rate is the 4.5N force doing work on the block at the instant when its speed is 4.0m/s.

Q. An ice skater is spinning at 20rad/s about her longitudinal axis when she abducts her arms and doubles here radius of gyration about her longitudinal axis from 30 to 60cm. if her angular momentum is conserved, what is her angular velocity about her longitudinal axis after she increases her radius of gyration?

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