# Time to reach maximum height

1. Apr 26, 2014

### jannx3

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

find time to reach max height
max height is 0.870m
mass of diver is 70kg
makes an angle when diving of 85 degrees

2. Relevant equations

Vf=Vi + gt

3. The attempt at a solution
Vi=0
Vf=gt
t=vf/g
= 0.870/9.8

not sure if this the right approach

2. Apr 26, 2014

### voko

When somebody is "diving", the direction is generally downward. One cannot reach a max height moving downward. State the problem correctly and fully, it is in your interest to eliminate any guesswork for us.

3. Apr 26, 2014

### jannx3

so when the person is diving from a diving board, it jumps upward before diving downwards into the water

4. Apr 26, 2014

### voko

So in fact the question is about jumping, not diving?

Then, when you say "makes an angle" - makes an angle WITH WHAT?

5. Apr 26, 2014

### jannx3

so im assuming the height of the diver? which is 1m , theres all the information given

6. Apr 26, 2014

### voko

OK, assuming the angle is with the vertical.

In your attempt, why does $v_i = 0$? Surely when somebody jumps, they have a non-zero velocity initially?