Doug is sliding down the hill on a piece of cardboard. His sister pushes him 3 points from behind. What effect foes this have on his motion? A. he stops
B. he speed up
C. he slows down
D. his motion remain the same

a coal burning power plant

answer: d. objects on jupiter experience more gravity due to more gases

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.