(1)v0t=S1=12m
1/2gt^2=h=2.4-0.9+0.1m
t=0.5657s
v0=21.21m/s
(2)
1/2gt^2=2.4m
t=0.692s
S2=v0t=14.68m
L=S2-S1=2.68m