4]a]
Applying conservation of momentum
P initial= P final
m1u1+m2u2= [m1+m2] V
10,000*2 +20,000*0= [10,000+20,000] V
20,000= 30,000* V
V=20,000/ 30,000= 0.67 m/s
b] Ke inital= 1/2m1u12+ 1/2m2u22= 1/2*10,000*22+ 1/2*20,000*02= 20,000J
KE final= 1/2[m1+m2]V2=1/2[30,000]0.672=6733.5J...