Posted by Shawn on Thursday, December 20, 2012 at 10:24pm.
A ball with a mass of 5.8 kg is moving to the right at 10.3 m/s and collides with a stationary ball of mass 10.9 kg. After the collision, the 5.8 kg ball moves to the right, but at an angle of 20° below the horizontal, at a speed of 4.3 m/s. Find the speed of the 10.9 kg ball if it travels to the right, but at an angle above the horizontal.

Physics  Elena, Friday, December 21, 2012 at 6:20pm
m1•v1+0 = m1•u(1x) +m2•u(2x)
0=m1•u(1y) + m2•u(2y)
m1•v1 = m1•u1•cos20⁰+m1•u2•cosα
0=  m1•u1•sin20⁰ +m2•u2•sinα .
m1•(v1 u1•cos20⁰)=m1•u2•cosα, .....(1)
m1•u1•sin20⁰ = m2•u2•sinα ...............(2)
Divide (2) by (1)
tan α = m1•u1•sin20⁰/m1•(v1  u1•cos20⁰)=
=u1•sin20⁰/(v1 u1•cos20⁰)=
=4.3•0.34/(10.34.3•cos20⁰)=0.234.
α = 13.16⁰
u2=m1•v1•sin20/m2•sinα=
=5.8•10.3•0.34/10.9•0.227 = 8.21 m/s
Check me on my math
Answer This Question
Related Questions
 Physics  A 6.00 kg ball (ball 1), moving to the right at a velocity of +1.00 m/...
 physics please help  A 5.00 kg ball (ball 1), moving to the right at a velocity...
 Physics  A stationary billiard ball, mass 0.17 kg, is struck by an identical ...
 physics  A stationary billiard ball, mass 0.17 kg, is struck by an identical ...
 Ap Physics  Ball A,with a mass of 1.75kg,moves with a velocity of 3.50 m/s. It ...
 PHYSICS (most is worked)  A glass ball, ball A, of mass 6.0 g moves at a ...
 Physics  A ball with a mass of 12 g is moving at 15 m/s. It collides with a ...
 physics please help me  A 5.00 kg ball (ball 1), moving to the right at a ...
 physics please help  A 5.00 kg ball (ball 1), moving to the right at a velocity...
 physics  A billiard ball moving at 6.00 m/s strikes a stationary ball of the ...
More Related Questions