4.55ms-1
12.00ms-1
30.00ms-1
50.00ms-1
Correct answer is A
\(M_1V_1 + M_2U_2 = V(M_1 + M_2)\)
5 x 10 + 6 x 0 = V(5 + 6)
V = \(\frac{50}{11} = 4.55\)m/s
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