Benchmark

This question is not graded, rather it serves as a way to determine your depth of learning. Answer the question to the best of your ability and give a reasoning behind your choice.

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Responses to Last Week's Benchmark

Incorrect Reasonings: 1. finding the acceleration and how long it took and taking by the time is the only way that really makes any sense to me.

2. I chose C because I know that the slope of a velocity vs. Time graph is the speed of the object and if I wanted to find the speed of an object, a Velocity vs. Time graph would be what I want to see.

3. I choose D because in order to find the the speed you have to know how far the train went in the 4 minutes. And in order to use all of the other answers you would have to know at least a little bit about the speed because both velocity and acceleration both deal with speed.

Correct Reasonings: 1.I chose B because the velocity vs time graph shows speed at the y axis and time in the x axis. You just have to match the two up and see where your speed is at 4 seconds.

2. I chose B because because the problem is asking us to find how fast the train is going 4 minutes into it's trip. To find the speed, find 4 minutes on the X-axis of the Velocity vs Time graph, then find the point of the line on the Y-axis, which is the speed at that time.