2048_Spring10_FinalExam

# 2048_Spring10_FinalExam - 77777 Instructor(s Matcheva/Sabin...

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77777 77777 1. A motorist is driving along a straight road at a constant speed of 60 m/s. At time t = 0 she passes a parked motorcycle police oﬃcer and begins to accelerate at a constant acceleration a . The oﬃcer takes oﬀ after her at t = 0 and accelerates at a constant acceleration of 2 a . What is the speed of the police oﬃcer when he reaches the motorist? (1) 240 m/s (2) 180 m/s (3) 160 m/s (4) 120 m/s (5) need to know a 2. If ~ A · ~ B = -| ~ A × ~ B | and neither ~ A or ~ B is zero, then the angle between them is: (1) 135 (2) 45 (3) 0 (4) 180 (5) 150 3. Near the surface of the Earth, a shell with mass M is shot with an initial velocity ~v 0 , at an angle of θ 0 with the horizontal as shown in the ﬁgure. At the top of the trajectory, the shell explodes into two fragments with mass m 1 and m 2 ( M = m 1 + m 2
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2048_Spring10_FinalExam - 77777 Instructor(s Matcheva/Sabin...

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