Un dinamometro tiene en su interior un muelle cuya constante es 80 N\m. ¿Que peso se habra colgado de el para producir un alargamiento de 7,5cm? ¿Y si el alargamiento es de 10cm?

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explanation:

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answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.