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imfunsize2011
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Homework Statement
A ball is fired vertically upward from the top outside ledge of a 256ft high building with an initial velocity of 160ft/sec. Assue lgl=32.0 ft/sec^2.
Homework Equations
What is the speed of the ball at t=3 seconds?
and
What is the velocity of the ball just before it hits the ground at the base of the building?
and
What was the total time the ball was in the air?
The Attempt at a Solution
it takes the ball 5secs to hit the max point of trajectory, the ball goes 400ft upward,
to find speed you have take the change in distance/ change in time. the time would be 3-0 but the distance is where I am stuck.
to find the velocity of the ball just before it hits ground. you take the change in displacement/change in time, but what is the time
the totall time it is in the air, i am totally lost on