solve question number 19
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m2=120g=120/1000=3/25kg
u1=6m/s
u2=5m/s
since the objects stick together after collision,
so combined final velocity will be v
by conservation of linear momentum,
m1.u1 + m2.u2=m1.v + m2.v
60/11 = v
5.5m/s=v
u1=6m/s
m2=120g=0.12kg
u2=5m/s
m1u1+m2u2=(m1+m2)v
v=m1u1+m2u2/m1+m2
= 0.1×6+0.12×5/0.1+0.12
= 0.6+0.6/0.22
= 1.2/0.22
= 5.45m/s