(2) 50 kilo newton
The momentum imparted to the two pieces together is:
As the body of 3 kg is initally at rest the change in momentum for the third piece should be equal and opposite that for the first two taken together.
Time taken for this change, Δt = 10-4 s
∴ Force on the third piece is
= 50 x 103 N = 50 Kilo newton