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Q.

Three blocks of masses $1 kg, 4 kg$ and $2 kg$ are placed on a smooth horizontal plane as shown in figure. Find the net force on $2 kg$ block.

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a

30 N

b

40 N

c

50 N

d

20 N

answer is D.

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Detailed Solution

$a = \frac{Net pushing force}{Total mass} = \frac{120 - 50}{1 + 4 + 2} = 10 m / s^{2}$

$F_{net} = m a = (2) (10) = 20 N$

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