Chapter 2 Sample Problem Packet

# Chapter 2 Sample Problem Packet - car is a x r =0 and the...

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Chapter 2 Sample Problems

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1) (a) If a particle’s position is given by x = 4-12t +3t 2 (where t is in seconds and x is in meters), what is its velocity at t = 1s? (b) Is it moving in the positive or negative direction of x just then? (c) Is the speed increasing or decreasing just then? (e) Is there ever an instant when the velocity is zero? If so, give the time t. (f) Is there a time after t=3 seconds when the particle is moving in the negative direction of x? If so give the time t.
2) As shown in the diagram, a red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to an axis. At time t=0, the red

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Unformatted text preview: car is a x r =0 and the green car is a x g =220 m. If the red car has a constant velocity of 20 km/hr, the cars pass each other at x = 44.5 m, and if it has a constant velocity of 40 km/hr, they pass each other at x = 76.6 m. What are (a) the initial velocity and (b) the acceleration of the green car? 3) At time t=0, apple 1 is dropped from a bridge onto a roadway beneath the bridge: somewhat later, apple 2 is thrown down from the same height. The diagram below gives the vertical positions y of the apples versus t during the falling, until both apples have hit the roadway. With approximately what speed is apple 2 thrown down?...
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## This note was uploaded on 01/11/2012 for the course PHYSIC 1 taught by Professor Fairport during the Spring '11 term at Fairfield.

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Chapter 2 Sample Problem Packet - car is a x r =0 and the...

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