1.) A car travels at 15 m/s for 10s. It then speeds up with a constant acceleration of 2.00 m/s^2 for 15s. At the end of this time, what is its velocity?(adsbygoogle = window.adsbygoogle || []).push({});

My answer: Vxf= 45 m/s

2.) An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

My answer: 39m

3.) A ball is thrown downward from the top of a building with an initial speed of 25 m/s. It strikes the ground after 2.0s. How high is the building?

My answer: 30m

4.) I can't draw a graph on here, so I'll describe it to the best of my abilities. It is a velocity versus(m/s) vs. time (s) graph.

The graph starts at the origin. At 2.0s, velocity increases 20 m/s. From 2.0 to 4.0 seconds, velocity is constant at 20m/s. From 4.0 to 6.0s, velocity is decreasing by 20 m/s. At 6.0 to 8.0s, velocity is decreasing another 20 m/s.

question: What is the displacement from 0 to 8.0s?

My answer: Honestly, I didn't know how to approach this one. All i did was I added up and subtracted...and got 20m.

5.) Which student used the least precise scale?

A. 49.06

B. 49

C. 50

D. 49.2

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# Graphical analysis, vx, ax, and xf problems

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