The john hancock center in chicago is the tallest in the united state's in which there are residential apartments. the hancock center is 343m tall. suppose a resident accidentally causes a chuck of ice to fall from the roof. what would be the velocity of the ice as it hits the ground? neglect air resistance.

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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.