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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
On a smooth plane surface (figure) two block $A$ and $B$ are accelerated up by applying a force $15\, N$ on $A$. If mass of $B$ is twice that of $A$, the force on $B$ is  ........... $N$
  • A
    $30$
  • B
    $15$
  • ✓
    $10$
  • D
    $5$
✓

Answer

Correct option: C.
$10$
c
$\begin{array}{l}
The\,acceleration\,of\,both\,the\,blocks = \\
\frac{{15}}{{3x}} = \frac{5}{x}\\
\therefore \,Force\,on\,B = \frac{5}{x} \times 2x = 10N
\end{array}$

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