in 1-2 sentences explain why two objects with the same mass when dropped at the same time height may not reach the ground at the same time use paper and rock as an example unless they dont have the same mass

Answer 1

Two objects like a paper and a rock, even if they have the same mass, may not reach the ground at the same time when dropped from the same height due to air resistance; the paper, being larger and less aerodynamically shaped, will be slowed down significantly by air drag compared to the rock, which will fall more quickly.