A boy with mass 50 kg running at 5 m/s jumps on to a 20 kg trolley travelling in the same direction at 1.5 m/s. What is their common velocity?
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Answer:
from m1u1 +m2u2 =(m1 +m2)v
50 x5 + 20 x 1.5 = (50 +20 ) v
V = 4m/s
common velocity is 4m/s
Explanation:
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