A 35.0 kg crate is accelerating horizontally across the floor. The coefficient of kinetic friction between the crate and the floor is 0.300. If the crate is being pulled along the floor with a force of 135 N at an angle of 40.0° above the horizontal, what is the crate's acceleration

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.

your answe is wheel and axle and lever