Posted by Annette on .
Two blocks of masses m1 = 2kg. and m2 = 4kg. are each released from rest at a height of h = 5m. on a frictionless track, and undergo an elastic headon collision. 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,
m₁gh= m₁v₁₀²/2 => v₁₀=sqrt(2gh)
m₂gh= m₂v₂₀²/2 => v₂₀ =sqrt(2gh)
m₁v₁₀  m₂v₂₀=  m₁v₁ + m₂v₂
v₁= {2m₂v₂₀ +(m₁m₂)v₁₀}/(m₁+m₂)
v₂={ 2m₁v₁₀  (m₂m₁)v₂₀}/(m₁+m₂)
m₁v₁²/2= m₁gh₁ => h₁=v₁²/2g
m₂v₂²/2= m₂gh₂ => h₁=v₁²/2g