Question

2
In the system shown in the figure, the acceleration of the 1 kg mass and the tension in the string connecting
between A and B is:
​

Answer 1

Answer:

If a is downwards acceleration of 4 kg block, the upwards acceleration of 1 kg block must be 2a.

Let T be the tension in each part of a string.

The equation of motion on 4 kg block is

4g-2T=4a ............(i)

The equation of motion or 1kg block is

T−1kg=1×2a .......(ii)

or 2T-2g=4a ....... (iii)

Adding (i) and (iii), we get

2g=8a or a=

4

g

∴ Acceleration of 1 kg block = 2a=

2

g

upwards.

Explanation:

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Answer 2

Answer:

2

In the system shown in the figure, the acceleration of the 1 kg mass and the tension in the string connecting

between A and B is: