Q64 / 90 · JEE Main 2024 (30 Jan Shift 2) · Physics

Three blocks $A, B$ and $C$ are pulled on a horizontal smooth surface by a force of $80 N$ as shown in figure. The tensions $T_{1} and T_{2}$ in the string are respectively:

Correct answer
A
$40 N, 64 N$
B
$60 N, 80 N$
C
$88 N, 96 N$
D
$80 N, 100 N$

Solution

Since, the length of the string will remain same. Hence, all blocks will have the same acceleration.
$a_{A} = a_{B} = a_{C} = \frac{F}{5 + 3 + 2} = \frac{80}{10} = 8 m s^{- 2}$
Therefore, $T_{1} = 5 \times 8 = 40 N$ .
Now,
$T_{2} - T_{1} = 3 \times 8 \Rightarrow T_{2} = 64 N$

Hence, the correct answer is option: 'A'.

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Three blocks A, B and C are pulled on a horizontal smooth surface by a force of 80 N as shown in figure. The tensions T1 and T2 in the string are respectively:

Solution

Relevant Questions

Three blocks $A, B$ and $C$ are pulled on a horizontal smooth surface by a force of $80 N$ as shown in figure. The tensions $T_{1} and T_{2}$ in the string are respectively: