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Q.

Three blocks of masses m1, m2 and m3 are connected by a massless string as shown in figure on a frictionless table. They are pulled with a force T3 = 40N. If m1 =10kg , m2 = 6kg and m3 = 4kg , then tension T2 will be

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a

10 N

b

20 N

c

32 N

d

40 N

answer is C.

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Detailed Solution

Fnet = ma , T3 - T2 = m3a ,T2 - T1 = m2a ,  T1 = m1asolving the above equations, we get
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Three blocks of masses m1, m2 and m3 are connected by a massless string as shown in figure on a frictionless table. They are pulled with a force T3 = 40N. If m1 =10kg , m2 = 6kg and m3 = 4kg , then tension T2 will be