15.0 ms-1
7.5 ms-1
3.8 ms-1
3.0 ms-1
Correct answer is D
M1U1 + M2U2
= (m1 + m2)v
= \(\frac{(0.1 {\times} 15) + (0.4 {\times} 0)}{(0.1 + 0.4)}\)
v = 3ms-1
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