Tuesday

March 3, 2015

March 3, 2015

Posted by **karla** on Thursday, September 23, 2010 at 3:51pm.

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 -
**MathMate**, Thursday, September 23, 2010 at 4:04pm - Physics -
**karla**, Thursday, September 23, 2010 at 4:06pmi still don't understand parts b and c.

- Physics -
**MathMate**, Thursday, September 23, 2010 at 5:43pm(b)

let u = velocity at the top of the window.

In t=0.3 second, the object has travelled -2.2 m with an acceleration of g=-9.8 m/s².

Use the kinematic equation

S(distance)=ut+(1/2)gt²

Solve for u to get

u=S/t-(1/2)gt

=-2.2/0.3-(-9.8)/2*0.3

= the same expression Mr.Pursley gave.

(c)

Equate potential and kinetic energies to get

mgh=(1/2)mu²

where u is obtained from (b) above.

Solve for h.

**Answer this Question**

**Related Questions**

physics - A stone is dropped off the science building and accelerates, from rest...

Physics - A stone, initially at rest, is dropped from the top of a building. On ...

Physics - While standing at the edge of the roof of a building, you throw a ...

physics - A stone is observed falling past a small window 1 meter tall in 0.2 ...

Physics - A stone is dropped from rest from the roof of a 100-m high building; 2...

physics - While standing at the edge of the roof of a building, you throw a ...

physics - While standing at the edge of the roof of a building, you throw a ...

Physics 11 - A stone at rest is dropped from a 20m tall building. After falling ...

Physics - a stone is dropped from a 75m building. when a stone has dropped 15m, ...

physics - A stone is dropped from a 75 m high building. when this stone has ...