Question

As shown in figure, find that at what distance body A will attain a velocity of 3 m/s when starts from rest. 

Answer 1

$g=9.81\ (m/s^2)$

So, we have

$s=\frac{v^2}{2a}=\frac{3^2}{2\cdot9.81}=0.46\ (m)$ . Answer