Free Fall

[Robdog]

1. The problem statement, all variables and given/known data

Two ball are dropped from 5m high, Use 10 m/s^2 for the magnitude of the acceleration due to gravity.


2. Relevant equations

How do i start?

3. The attempt at a solution

not sure on how to start so i havent attempted:(

[Astronuc]

What is the question or problem to be solved?

Neglecting air resistance, they both accelerate at the same rate.

One might find this a useful reference - http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html

[Robdog]

the problem asks how much time is elapsed during the fall of the 5.0m at a rate of 10m/s^2

Im sure there is an equation for this but i dont know which one or where to find it...

[Astronuc]

If something starts at rest, i.e. with zero velocity, how far does is travel in time, t, if the acceleration is constant.

See - http://hyperphysics.phy-astr.gsu.edu/hbase/acons.html

The same concept applies for horizontal (x) or vertical (y) motion, provided the acceleration is constant.

[Robdog]

so... y=1/2at^2... y equal to the hight of 5m? if so then i get 5m=1/2(10m/s^2)T^2 which = square root of 5.00s which = 2.24s??? but the that answer is still wrong. What did i do wrong.

[Robdog]

o nvm should be the square root of 1.00s.... ill try that, wow i feel like an idiot... i need to sleep

[Astronuc]

Well - you figured it out. Do get some sleep, and refer to hyperphysics when the mind is more relaxed.