In physics, this scenario describes IMPULSE ... F x t also known as the change in momentum...(final momentum = 0)
Momentum = m x v
= .1 mg x 1kg/1000mg x 3 x 10^3 m/s = .3 kg-m/s = .3 N-s
F x t = .3 n-s
F = .3 N-s / (6x 10^-8 s) = .05 x 10^8 N = 5 x 10^6 N BANG ! You just spent $ 50,000.