Question

find the tension ina string and acceleration of 3kg block.​

Answer 1

Answer:

Let the acceleration of lower pulley be a relative to the upper pulley.

And the acceleration of 2 kg and 3 kg blocks relative to lower pulley be b upwards and b downwards respectively.

Also, if the tension in above string is 2T, then tension in lower string will be T since force on pulley has to be 0.

Hence, balancing forces on upper pulley, 4T=80 N

or, T=20 N

Hence for 3 kg block,

3(10)−20=3a

or, a=

3

10

=3

3

1

m/s

2

downwards.

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