the glider collides elastically an another glider at rest, in this case we have the coservation of quantity of movement
m1 v1 + m2 v2 = m1V1 + m2 V2
v is the velocity before the shock, V the velocity after the shock
m1=0.22
v1=0.60m/s
m2=0.44
V1=-0.20m/s
remark that 0.44 kg glider is initially at rest, so v2= 0
the equation above can be written m1 v1 = m1V1 + m2 V2 ( because v2=0 at rest)
m1 v1 = m1V1 + m2 V2 implies V2= (m1v1 -m1V1) / m2
V2=0.22x0.60 -0.22x (-0.20) ] / 0.44= 0.4m/s