Question

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather.

Which result is expected?

The hammer hits the ground before the feather on both Earth and the moon.
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
The hammer and the feather hit the ground together on both Earth and the moon.
The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon

Answer 1

The hammer hits first on Earth, and they hit together on the Moon.

Reason: In air the feather suffers much more aerodynamic drag so it falls slower than the hammer. In the Moon’s near vacuum there’s effectively no air resistance, so both objects accelerate at the same rate (gravity applies equally to all masses) and land together (though more slowly than on Earth, since Moon gravity is about 1/6 g).