Homework Help: physics

Posted by joyce on Thursday, September 23, 2010 at 1:09pm.

A stone is dropped off the science building and accelerates, from rest, toward the ground at 9.8 m/s/s. A curious physics student looks out the third floor window as the stone falls past. She happens to have a stopwatch and she finds that it takes 0.30 sec for the stone to fall past the 2.2 m tall window. She then sketches the velocity vs. time plot shown below, but realizing she is late for lunch, she doesn't use the plot to analyze the motion of the stone.

A) WHat was the average velocity of the stone as it fell past the window?

B) What was the velocity of the stone at the top of the window?

C) From what height above the top of the window did the stone start its fall?

physics - bobpursley, Thursday, September 23, 2010 at 1:40pm
average velocity= 2.2/.3 m/s
So, if the average velocity is that, that is the velocity at the center. What is the velocity at the top of the window?

Vf=Vi-gt
Vf(at top)=-2.2/.3-9.8(-.15) where t is before the center, at t=-.15
Vf you calculate.
Height?
Vf(top of window)^2=2*g*d
solve for distance d.
physics - karla, Thursday, September 23, 2010 at 4:05pm
i still don't understand how to do parts b and c.

Answer this Question

Related Questions

Physics - A stone is dropped off the science building and accelerates, from rest...
Physics - A stone is dropped from rest from the roof of a 100-m high building; 2...
calculus - use to postion function s(t) = -4.9t^2 + vt + s for free-falling ...
calculus - use to postion function s(t) = -4.9t^2 + vt + s for free-falling ...
physics - A stone is dropped from the roof of a tall building. A person measures...
physics - A stone is dropped from a 75 m high building. when this stone has ...
physics - A stone is dropped from a 75 m high building. when this stone has ...
Physics - a stone is dropped from a 75m building. when a stone has dropped 15m, ...
Physics - A ball is dropped from rest off a 34 m building. How long does it take...
physics - A ball is dropped from rest off a 31 m building. How long does it take...

For Further Reading

First Name:
School Subject:
Answer: