Question number 7 and 8 please answer fast
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according to law of conservation of momentum,
m1u1 + m2u2 = m1v1 + m2v2
0.1kg * 20m/s + 0.3 * 10m/s = 0.1kg * 15m/s + 0.3kg * (x) m/s
2kg.m/s + 3kg.m/s = 1.5kg.m/s + 0.3kg.m/s
5kg.m/s - 1.5kg.m/s = 0.3 (x)kg.m/s
(3.5 kg.m/s)/0.3kg = (x)m/s
11.6 m/s which can be rounded off to 12 m/s
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