Edexcel M2!!!! How did it go?Watch
Got speeds by solving simultaneous equations:
e=vblahblahblah and conservation of energy equation
a=1/3(1+e)u, b=1/3(1-2e)u (or other way round)
Got e values by putting speed of b greater than speed of a and greater than 0:
Proved another collision by showing speed of b after collision with wall was greater than a:
equated two equations and then put e in as 1/2, worked alright but not 100% sure bout this though.
Used P=fv for power one