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PHYS-1100 Fall 2009 Exam 2 answer key

PHYS-1100 Fall 2009 Exam 2 answer key - 1 During a...

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1. During a Triathalon, an athlete first swims 800 m in 14 minutes, then bicycles 12 km at an average speed of 19 km/hr, and finally completes a 5 km run in 26 minutes. What is the athlete's approximate average speed for the whole event? a) 11.3 km/hr b) 12.6 km/hr *(6) c) 13.7 km/hr d) 15.2 km/hr e) none of these are even approximately correct 2. In the absence of air resistance, a football dropped from the top of the Memorial Tower near the Parade Grounds would strike the pavement below about 3.3 seconds later. Approximately how tall is the Memorial Tower? *(6) 3. A particle is moving in a straight line and is getting slower. What can correctly be inferred from this information? *(6)

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