Fa ball dropped from a tower reaches the ground after 3.5 seconds, what is the height of the tower? given: g = –9.8 meters/second2

Let's use the second kinematic equation:
Δy = vot + 1/2gt²

Δy = 0(3.5) + 1/2(-9.8)(3.5)²

Δy = -4.9(3.5)² = -60.03 m

So the ball falls 60.03 m, meaning that's the height of the building. The negative sign just means I put the y = 0 mark at the top of the building.

Make sense?

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /