A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v₀ and experience no significant air resistance.If the 10-kg rock reaches a maximum height h,what maximum height will the 20-kg ball reach? A)h/4 B)h/2 C)h D)2h E)4h

Question

Quizplus · Accepted Answer

Since the two rocks are thrown upward with the same initial speed, the only factor that affects their maximum height is their mass. From the conservation of energy, we know that at the maximum height, all of the initial kinetic energy is converted to potential energy. Since the potential energy is proportional to the mass, the 20-kg rock will have twice the potential energy of the 10-kg rock at the same height. Therefore, the maximum height the 20-kg rock can reach is twice that of the 10-kg rock, which is h. Therefore, the best answer choice is (C).

A 10-Kg Rock and a 20-Kg Rock Are Thrown Upward