Answer to Question #163006 in Mechanics | Relativity for Lwendo

Question

50j work must be done to lift a vase from the ground up to the shelf. (1)how much potential energy does the vase have when it is on the shelf? (2)if the vase falls from the shelf how much kinetic energy does it have just before it hits the ground? (3)what happens to this energy after the vase has hit the ground? (4)state the law of conversation of energy?

Answer 1

(a) The gravitational potential energy of the vase on the shelf

$E_{pi}=50\;\rm{J}$

(b) The law of conservation of energy gives

$E_{kf}=E_{pi}=50\;\rm{J}$

(c) When the vase has hit the ground, it energy would be transferred to the ground.

(d) The law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.