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PHY303k_-_Spring_2010_-_HW_2

# PHY303k_-_Spring_2010_-_HW_2 - saldana(avs387 Homework 02...

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saldana (avs387) – Homework 02 – florin – (58140) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The position-versus-time graph below de- scribes the motion of three different bodies (labeled 1, 2, 3). 1 2 3 x B x A t A t B x t A B Consider the average velocities of the three bodies. Which of the following statements is correct? 1. ¯ v 1 < ¯ v 2 < ¯ v 3 2. ¯ v 1 > ¯ v 2 > ¯ v 3 3. ¯ v 1 > ¯ v 2 and ¯ v 3 > ¯ v 2 4. ¯ v 1 = ¯ v 2 = ¯ v 3 correct Explanation: Average velocity is ¯ v = displacement time = x B - x A t B - t A . All three bodies have exactly same displace- ment in exactly same time, so the average velocities are exactly equal: ¯ v 1 = ¯ v 2 = ¯ v 3 . 002 (part 1 of 3) 10.0 points The position of a car coasting down a hill was observed at various times and the results are summarized in the table below. time distance 0 s 0 . 77 m 1 s 3 . 4 m 2 s 11 . 7 m 3 s 20 . 9 m 4 s 48 m 5 s 67 . 2 m Find the average velocity of the car during the first second.

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PHY303k_-_Spring_2010_-_HW_2 - saldana(avs387 Homework 02...

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