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vp=500m/s
mb=50kg
vb=0
vp'=50m/s
mb'=?
mp x vp + mb x vb = mp x vp' + mb vb'
0,005 x 500 + 50x0 = 0,005 x 50 + 50 vb'
2,5 = 0,25 + 50 vb'
2,25 = 50 vb'
vb'= 2,25/50
vb'= 0,045 m/s