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Physics HW #2

# Physics HW #2 - madding(cmm3632 HW02 markert(56475 This...

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madding (cmm3632) – HW02 – markert – (56475) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points If the acceleration of an object is zero at some instant in time, what can be said about its velocity at that time? 1. It is not changing at that time. 2. It is negative. 3. It is zero. 4. Unable to determine. 5. It is positive. 002 10.0 points An object travels 6 m in the first second of travel, 6 m again during the second second of travel, and 6 m again during the third second. What is the approximate average accelera- tion of the object during this time interval? 1. 5 m/s 2 2. 9 m/s 2 3. 4 m/s 2 4. 3 m/s 2 5. 6 m/s 2 6. 7 m/s 2 7. 0 m/s 2 8. Unable to determine 9. 8 m/s 2 003 10.0 points A record of travel along a straight path is as follows: (a) Start from rest with constant accelera- tion of 2 . 53 m / s 2 for 19 . 9 s; (b) Constant velocity of 50 . 347 m / s for the next 0 . 864 min; (c) Constant negative acceleration of - 10 . 5 m / s 2 for 3 . 91 s. What was the total displacement x for the complete trip? Answer in units of m. 004 (part 1 of 2) 10.0 points The initial speed of a body is 7 m / s.

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