# Express Max height in terms of g and T? ?

1. Sep 7, 2010

### scke0803

Express Max height in terms of g and T???!!!???

I need to express the y_max in terms of g and T...

do i need to put in my V_0y value? or leave it as a variable?

i've tried V_0y*T + 1/2gT^2

2. Sep 7, 2010

### ehild

Re: Express Max height in terms of g and T???!!!???

Vo is not a variable, it is constant. Your formula is correct for the height at time T. You have to find the time when the body reaches it maximum height and does not rise any more. What is its velocity at that instant?

ehild

3. Sep 7, 2010

### scke0803

Re: Express Max height in terms of g and T???!!!???

Velocity at maximum height is 4.229 m/s

4. Sep 7, 2010

### ehild

Re: Express Max height in terms of g and T???!!!???

So it moves further upward. Why is it maximum height then?
Try to throw up something and watch the velocity.

And mind the signs. There is a maximum height if Vo points upward (and g downward) . Vo and g have to be of opposite signs.

ehild

Last edited: Sep 7, 2010