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Introductory Physics Homework Help
Motion with gravitational, elastic, and friction forces
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[QUOTE="BvU, post: 4987982, member: 499340"] Please fix the "falling at when" in the problem formulation... Is it really 4 m/s ? So it's been dropped from 0.8 m and it compresses the spring by 2 m ? I thought buildings were a little higher :) (but I agree that that's the problem maker's responsibility, not the problem solver's) If you lift the 2000 kg by 2 m, do you increase its potential energy or do you decrease it ? So does gravity do positive or negative work ? If you lower the 2000 kg by 2 m, do you increase its potential energy or do you decrease it ? So does gravity do positive or negative work ? In fact, potential energy is ##\ \ \displaystyle -\int \vec F \cdot \vec {dx} = -mg\Delta h## and in that last expression g is -9.8. Sloppy popular language is then U = mgh.The work gravity does has to be dissipated/absorbed by clamp/spring. If down is negative, you want to write 17000 * -2 in order not to confuse the reader... [/QUOTE]
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Introductory Physics Homework Help
Motion with gravitational, elastic, and friction forces
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