MCQ
Find the acceleration of block $B$
- A$0$
- B$\frac{5}{2}\,m/s^2$
- ✓$\frac{5}{7}\,m/s^2$
- D$\frac{5}{14}\,m/s^2$
✓
Answer
Correct option: C.
$\frac{5}{7}\,m/s^2$
c
$A: 5 g-T=5(2 a)$
$A: 5 g-T=5(2 a)$
$B: 2 T-8 g=8(a)$
Where $'a'$ is acceleration of block $B$ upwards
$\Rightarrow 2 g=28(a)$
$a=\frac{20}{28}=\frac{5}{7} \mathrm{m} / \mathrm{s}^{2}$
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