The acceleration due to gravity on Earth’s moon is about 1.6m/s2. An astronaut with full survival pack has a mass of 100kg. He lifts a large boulder (rock) having a mass of 50kg. Losing his balance, and letting go of the boulder, the explorer trips and falls off a ledge that is 2m above the moon’s surface. Assuming that both the astronaut and the rock are the same distance from the surface of the moon, which object will hit the ground first:the astronaut or the rock? Explain your answer.