Three blocks A, B and C are pulled on a horizontal smooth surface… - Vidyadip

MCQ

Three blocks $A$, $B$ and $C$ are pulled on a horizontal smooth surface by a force of $80 \mathrm{~N}$ as shown in figure

The tensions $T_1$ and $T_2$ in the string are respectively

✓
$40 \mathrm{~N}, 64 \mathrm{~N}$
B
$60 \mathrm{~N}, 80 \mathrm{~N}$
C
$88 \mathrm{~N}, 96 \mathrm{~N}$
D
$80 \mathrm{~N}, 100 \mathrm{~N}$

✓

Answer

Correct option: A.

$40 \mathrm{~N}, 64 \mathrm{~N}$

a
$a_A=a_B=a_C=\frac{F}{5+3+2}=\frac{80}{10}=8 \mathrm{~m} / \mathrm{s}^2$

A$\mathrm{T}_1=5 \times 8=40$

$\mathrm{T}_2-\mathrm{T}_1=3 \times 8 \Rightarrow \mathrm{T}_2=64$

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