Total momentum of \\\\(N\\\\) balls\\\\(=N m v=N (1\ imes5)=5N\\\\)\\\\(\ herefore \\\\) Momentum of the block along with \\\\(N\\\\) balls\\\\(=5N\\\\) or\\\\((M+Nm)\\\\) \\\\({v}'=5N\\\\) where \\\\({v}'\\\\) is the velocity of the blockAfter \\\\(N\\\\) balls are collected in the basket.\\\\(\ herefore {v}' =\\displaystyle \\dfrac{5N}{5+N}=\\dfrac{5}{\\dfrac{5}{N}+1}\\\\)For \\\\(N=5\\\\); \\\\({v}'\\\\) \\\\(=2.5\\ m/s\\\\)For \\\\(N=10\\\\); \\\\({v}'\\\\) \\\\(=10/3\\ m/s\\\\)Also \\\\({v}'\\\\) is never exactly equal to \\\\(5 m/s.\\\\)From above we can say that increase in speed of the ball is not same every time for collection of each ball in the basket, it varies.