In order to use Newtonâ€™s Second Law, you need to correctly draw the Free Body Diagram. This problem explains a common mistake students make involving the force applied. We also review how to find acceleration on a velocity as a function of time graph.
0:22 The problem
0:54 Listing our known values
1:51 Drawing the Free Body Diagram
2:17 A common mistake in our Free Body Diagram
3:32 Solving the problem
4:14 Another common mistake
5:07 Why is the acceleration positive?
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