Posted by **anne** on Saturday, May 14, 2011 at 2:04pm.

A ball is thrown vertically upward with a speed of +12.0 m/s.

How long does the ball take to hit the ground after it reaches its highest point?

What is its velocity when it returns to the level from which it started?

- physics -
**Damon**, Saturday, May 14, 2011 at 3:04pm
Well, the easy way is to say the average speed of the ball on the awy up is (12 + 0) / 2 = 6 m/s

Now how high did it go?

(1/2) m v^2 = m g h

144/2 = 9.8 h

h = 7.35 meters up

so

6 t = 7.35

t = 1.22 seconds

part 2 is trivial, same speed down as up but opposite direction, -12 m/s

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