The cart in figure 1 rests on a ramp which is inclined 30 degrees with respect to the horizontal. At t=0s the cart is released from rest(i.e with no initial velocity). As indicated, the air resistance is proportional to the velocity squared.
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The solution contains a word document with a step by step answer. It also contains the MATLAB/SIMULINK analysis of the question in an attachment. The solution are easy to follow and learn with a schematic diagram.