From the edge of a roof top you toss a green ball upwards with initial speed v₀ and a blue ball downwards with the same initial speed. Air resistance is negligible. When they reach the ground below...
a) The green ball will have greater kinetic energy than the blue ball
b) The blue ball will have greater kinetic energy than the green ball
c) Both balls will have the same kinetic energy
d) The kinetic energy of the balls cannot be determined without knowing their masses