A student attaches a rope to a brick and pulls the brick across a rough surface at a constant speed. The forces that should be included in a free body diagram for the brick are: A) force of friction
B)normal force
C) gravity
D) tension force

a sonic boom is a loud boom that breaks the sound barrier

explanation:

answer(20) psi;

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.