Friday

August 22, 2014

August 22, 2014

Posted by **Jessica** on Monday, October 29, 2012 at 3:35pm.

(a) Determine the velocity of each block just before the collision.

(b) Determine the velocity of each block immediately after the collision.

(c) Determine the maximum heights to which m1 and m2 rise after the collision.

- Physics -
**Elena**, Monday, October 29, 2012 at 4:10pm(a) The law of conservation of energy:

PE=KE

mgh =mv²/2

v=sqrt(2gh) = sqrt(2•9.8•5) = 9.9 m/s

m1==> v1 =+9.9 m/s

m2 ==> v2 = - 9.8 m/s

(b) the law of conservation of linear momentum:

After elastic collision

u1 = [(m1 - m2)/(m1 + m2)]•v1 + [ 2 •m2/(m1 + m2) ]•v2

u1 = [(2 kg – 3.7)/(2 + 3.7)]•(9.9) + [ 2•3.7 /(2 + 3.7)]•( - 9.9)=...

u2 = [2• m1 /(m1 + m2)]•v1 + [(m2 - m1) / (m1 + m2) ]•v2

u2= [2 •2 ) / (2 + 3.7)] •9.9 + [ (3.7- 2 ) / (2 + 3.7)]•( - 9.9 )=...

(c) law of conservation of energy:

KE=PE

mu²/2= mgh

h= u²/2g,

=>

h1= u1²/2g

h2= u2²/2g

- Physics -
**Elena**, Monday, October 29, 2012 at 4:12pmmgh =mv²/2

v=sqrt(2gh) = sqrt(2•9.8•5.6) = 10.5 m/s

Correct further calculations...

**Related Questions**

physics - The masses of blocks A and B are 4.5 kg and 3.7 kg respectively. The ...

please help me!! physics - The masses of blocks A and B are 4.5 kg and 3.7 kg ...

physics - Two blocks with masses m1 = 1.10 kg and m2 = 3.10 kg are connected by ...

physics - Two blocks with masses m1 = 1.10 kg and m2 = 3.10 kg are connected by ...

Physics - Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are connected by...

Physics/mats - Two blocks with masses m1 = 1.40 kg and m2 = 3.00 kg are ...

Physics - Two blocks of masses m1 = 2kg. and m2 = 4kg. are each released from ...

physics - Two masses are hung are connected by a light cord and hung from a ...

physics - Two blocks, joined by a string, have masses of 6 and 9kg. They rest on...

Science: Physics and Chemistry - I was given a systems equation. Two masses are ...