9.Jenny is sitting on a sled on the side of a hill inclined at 15. What force is required to keep the sled from sliding down the hill if the combined weight of Jenny and the sled is 90 pounds?

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10.Anne is pushing a wheelbarrow filled with mulch to place in her garden. She is pushing the wheelbarrow with a force of 70 N at an angle of 50 with the horizontal. How much work in joules is Anne doing when she pushes the wheelbarrow 25 meters?

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11.A baseball player running forward at 3 meters per second throws a ball with a velocity of 20 meters per second at an angle of 20^o with the horizontal. What is the resultant speed and direction of the throw?

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12.Write 18(cos169 + isin169) in rectangular form. Round numerical entries in the answer to two decimal places.

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