Question

Two blocks of masses 3 kg and 4 kg are connected to a string. When a force of 21 N acts on 4 kg mass then find the tension in the string?
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Answer 1

Answer:

» larger mass =m2=4kg

» Tension = T

» For mass m

1

=> T−m

1

g=ma ____eq(1)

» For mass m

2

=> m

2

g−T=m

2

a. ____eq(2)

» By eq(1) + eq(2)

=> (m

2

−m

1

)g = (m

1

+m

2

)a

=> a=(m

2

−m

1

)g/(m

1

+m

2

)

=> a=(4−3)×10/(4+3)

=>a=1×10/7=10/7

=> a=33.6ms

−

2

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