# Homework Help: Free Fall and max altitude Question

1. Nov 12, 2007

### oconn1

A ball is thrown vertically upward from the ground with an intial speed of 15m/s. How long does it take the ball to reach its maximum altitude? What is its maximum altitude? Determine the velocity and accelartion of the ball at t=2s.

If anyone can help me with the relatively simple problem much thanks will be given! :)

ANY HELP IS GREAT!!

2. Nov 12, 2007

### dynamicsolo

One part of the questions you can answer right away is: what is the acceleration of the ball? Is it the same when the ball is thrown as it is later on, or does it change?

You are asked about the maximum altitude of the ball and when it reaches that point. The ball is traveling straight up and (presumably) falls straight back down. What is its velocity at the peak? What could you use to figure out how long it takes for that to happen? After that, you should have something else you can use to tell you how far up it gets when that happens.