Question

Ball A of 0.15kg moves to the right at a velocity of 0.25 m/s and strikes another ball B of 0.25 kg that is in rest. Find the Velocity and direction of each ball after the collision. Draw a ilustrative diagram. Pressume and elastic shock

Answer 1

by linear momentum conservation ( take right as + and left as - )  

Pi= Pf

0.15*0.25+ 0.25*0 = 0.15*v₁ +0.25*v₂ ......... 1

by energy conservation

1/2*0.15*0.25² = 1/2*0.15*v²₁ +1/2*0.25*v²₂

0.15*0.25² =0.15*v²₁ +0.25*v²₂ .........2

from 1and 2

v₁ = -0.0625 m/s

v₂ = 0.1875 m/s

see explanation below