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CU 2009 sp final exam key

# CU 2009 sp final exam key - 1 of 15 Final Exam vers 0001...

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2 of 15 vers 0001 5/7/2009 1. A bicycle is moving in the positive direction with a constant velocity of +5 m/s. The brakes are applied and it takes 2 seconds to stop the bike. The acceleration of the bike while the brakes are applied A) is zero B) is positive C) is negative D) changes sign. 2. If you drop a ball from rest, what is the change in speed of the ball during the time interval between t = 1 seconds and t = 4 seconds? (Assume no air resistance). A) increases by 2.45 m/s. B) increases by 4.9 m/s. C) increases by 9.8 m/s D) increases by 19.6 m/s. E) increases by 29.4 m/s. Δ v = gt 2 gt 1 = g Δ t = (9.8)(3) m / s = 29.4 m / s 3. The velocity of an object that is moving with constant acceleration is shown at two different times: v 1 is the velocity at an earlier time and v 2 is the velocity at a later time. What is the direction of the acceleration of the object? A) Up B) right C) Down D) Left E) Some other direction. Δ v = v 2 v 1 = (3, 1) (3,1) = (0, 2)
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