An astronaut plays paddle ball in orbit. The ball is hit with a speed of 5.21 m/21 m/s in the positive direction and has an average negative acceleration of 4.5 m/s2. How long does it take for the ball to reach a final velocity of -3.2 m/s?

explanation:

wheres the pic

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

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.