Question

In the figure, all surfaces are smooth. Find the acceleration of the body and the force exerted by the floor on the body. (Take $g=10m/s^2$)

• A. $0,100N$
• B. $4m/s^2,200N$
• C. $2m/s^2,210N$
• D. $0,220N$

Answer 1

The correct option is D $0,220N$

FBD of the body is


Net horizontal force:
$\sum F=10+10-\frac{20\sqrt{2}}{\sqrt{2}}=0N$

$\sum F=ma\Rightarrow a=0$

Net vertical force:
$N-20\sqrt{2}sin{45}^o-20g=0N-20\sqrt{2}\times \frac{1}{\sqrt{2}}-20\times 10=0N=220N$