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May 24, 2013

# Homework Help: physics

Posted by molly schwalje on Wednesday, December 15, 2010 at 5:17pm.

A friend throws a baseball horizontally. He releases it at a height of 2.0 m and it lands 21 m from his front foot, which is directly below the point at which he released the baseball. (a) How long was it in the air? (b) How fast did he throw it?

• physics - Damon, Wednesday, December 15, 2010 at 5:41pm

First solve the vertical plane problem.
How long does it take to drop from 2 meters ? It has zero initial velocity down.
-2 = 0 + 0 t +(1/2)(-9.8) t^2

t^2 = 4/9.8
t = .64 seconds in the air

then distance = speed * time
21 = speed * .64

• physics - katerina C., Wednesday, December 15, 2010 at 5:52pm

thankyou!!

• physics - katerina C., Wednesday, December 15, 2010 at 6:01pm

wait i believe this is not my problem? mine is the cannon problem

• physics - Damon, Wednesday, December 15, 2010 at 8:09pm

Same problem, different numbers

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