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Earlier discussion
2 older comments kept for context.
Chigozie
Formula for K.e= ½MV²
M= 0.05+0.95=1
V= 200×0.05 = 10
½×1×10² = 50J
Ayomide
It has to do with change in momentum
M1u =m2v
M1=0.05, u=200, m2= mass of bullet + mass of wall, v=?
Then you get your v as 10
Substitute the value of v for v in the formula of kinetic energy i.e 1/2 MV*V
Then you get 50N