A football, a hockey puck, and a tennis ball all fall down in the absence of air resistance. Which of the following will land first on the ground, and why?

same time

Explanation:

If there is no air so all the things are there in a condition of free fall . In such condition the gravity will attract all the things with same accelaration I.e 9.8 m/s.So all the objects will fall at the same time.

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i'm just gonna leave this comment here, so i can get a challange done-

explanation:

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.