Question

Err, a little help please.

The problem goes like this:
A ball is thrown vertically upward from the ground with an initial velocity of 20ft/sec.

What is asked is:
1. Give the equation v(t) to solve for the length of time the ball will be going up.
2. How long will the ball go up?
3. The equation s(t) to solve for the maximum height the ball can reach.
4. How high the ball will go?
5. How long will it take to reach the ground?
6. At what speed will the ball strike the ground?

This is kind of tricky, but I just wanted the equations...

Answer 1

But still, I need help in getting the answers. :\

Answer 2

use newtons motion of equation and take acceleration -ve while ball goes up

Answer 3

http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/video-lectures/lecture-4/