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Please circle ONLY one answer for multiple choice questions given & submit ONLY this test. Grading guidelines are as posted on Brightspace on first day of class Problems 1,2 & 3 are worth 4 points each 1. A sled starting from rest slides down a 20 m high smooth incline to the bottom. What is the velocity of the sled at the bottom? (A) 19.8 m/s (B) 392 m/s (C) 4.36 m/s (D) 7.57 m/s (E) None of the above 2. A 300 g ball moving horizontally to the right at 20 m/s hits a vertical wall and rebounds in the opposite direction at the same speed. If the interaction was 0.01 s, what is the average force felt by the ball? (A) 600 N (B) - 600 N (C) 1200 N (D) - 1200 N (E) None of the above 3 How much work do you do when you lift a 5 kg mass vertically up, 1.5 m, at an acceleration of 1.6 m/s? ? (A) 73.5 J (B) 7.5 J ( C ) - 85.5 J ( D) 85.5 J (E) None of the above Problems 4 & 5 are worth 6 points each A box of mass m is pulled along a rough horizontal floor by a force applied at 0 above the horiztonal. If the box moved Ax and the coefficient of friction between it and the floor is HK what is the work done by the frictional force? (A) ukmigl Ax (B) ukm/g|Fsine Ax C) Uk (mig|+Fsine)4x D) JK (mig)-Fsine)Ax (E) None of the above 5. 2 m? If a force given by the following acts on a body, what is the work done over a displacement of 0- F(x) =6x2 - 2x +3 (A) 23 J (B) 18 J (C) 22 J ( D) OJ (E) None of the above