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June 10th, 2012, 12:53 PM   #11
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Re: A train of 3000 KN

Since the parachute is falling, we may take the positive direction to be down.

There are two forces acting upon it, its weight and the resistive force of the air, which opposes the motion.

Draw a free-body diagram and it will be very clear.
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June 10th, 2012, 01:27 PM   #12
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Re: A train of 3000 KN

thanks so much ... now is clear ....
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