A 20 N ball and a 40 N ball are dropped at the same time from a height of 10 meters. Air resistance is negligible. Which of the following statements is accurate?

a) The heavy ball has a greater acceleration and falls faster.
b) The light ball has a greater speed since it can accelerate faster than the heavy ball.
c) After 1 second has elapsed, both balls have the same kinetic energy since they have the same acceleration.
d) Both balls hit the ground at the same time but gravity does more work on the heavy ball than on the light ball.