One-Dimensional Gravitational Motion

[BMWPower06]

Homework Statement

It takes 2.70 s for a small ball with a mass of 0.050 kg released from rest from a tall building to reach the ground. Calculate the height from which the ball is released.

Homework Equations

F=MA
Vo=h/t - .5at

The Attempt at a Solution

I plugged in all the knowns into the above equation but was still left with an unknown initial V and an unknown height. unsure how to proceed.

 

[CaptainZappo]

Homework Statement

It takes 2.70 s for a small ball with a mass of 0.050 kg released from rest from a tall building to reach the ground. Calculate the height from which the ball is released.

Homework Equations

F=MA
Vo=h/t - .5at

The Attempt at a Solution

I plugged in all the knowns into the above equation but was still left with an unknown initial V and an unknown height. unsure how to proceed.

Well, the problem says the ball was released from rest. What does this imply about the initial V?

 

[BMWPower06]

Well, the problem says the ball was released from rest. What does this imply about the initial V?

o ok it is zero, is the rest of my equation correct?

 

[BMWPower06]

so I've got:
0= h/2.7 +13.23

 

[CaptainZappo]

It looks right to me.