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Byju's Answer

Standard XII

Physics

2nd Equation of Motion

Two blocks A ...

Question

Two blocks A and B of masses 5 kg and 4 kg respectively are connected by a light string. If a constant force of 9N is applied to 5kg block, the tension in the string is

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Solution

The correct option is C
4N

Let's assume block A has an acceleration of magnitude 'a' leftwards.

By constraint relation block B will also have an acceleration 'a' leftwards. Let's draw Free Body Diagram of A and B.

$\to$ acceleration in leftward direction $\to$ acceleration in leftward direction

$\to$ using 2nd law $\to$ using 2nd law

9 - T = 5a -----------------(I) T = 4a -----------------(II)

Adding (I) & (II) we get

9 = 9a

a = 1 m/ $s^{2}$

Substituting the value of 'a' in equation (II)

T = 4N

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