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## Homework Statement

You drop a ball (0.5kg( from a height of 4m. How long did the ball take to hit the ground?

## Homework Equations

Assume that initially the velocity is 0 for the following equations below.

[tex]\Delta[/tex]Position = [tex]\Delta[/tex] Velocity * [tex]\Delta[/tex] Time

Acceleration = [tex]\Delta[/tex] Velocity / [tex]\Delta[/tex] Time

## The Attempt at a Solution

Acceleration is -10m/s due to gravity.

[tex]\Delta[/tex]X = [tex]\Delta[/tex] V * [tex]\Delta[/tex] T

4 = [tex]\Delta[/tex] V * [tex]\Delta[/tex] T

4 = V * (V/10)

4 = V

^{2}/10

40 = V

^{2}

Root(40) = V

Then just plug in and solve for time.

Root(40)/(10m/s) = [tex]\Delta[/tex]T

[tex]\Delta[/tex]T is approximately .63 seconds.

I don't know if this is right.. seems like a short amount of time to be honest.