Question

In the figure shown the velocity of lift is 2 m/s while string is winding on the motor shaft with velocity 2 m/s and block A is moving downwards with velocity of 2 m/s, the find out the velocity of block B.

• A. $2\frac{m}{s}$
• B. $4\frac{m}{s}$
• C. $5\frac{m}{s}$
• D. $6\frac{m}{s}$

Answer 1

The correct option is D $6\frac{m}{s}$

${\overrightarrow{V}}_{B,l}=4m/s\uparrow ,{\overrightarrow{V}}_{B,l}={\overrightarrow{V}}_{Bg}-{\overrightarrow{V}}_{lg}$



$\Rightarrow 4m/s={\overrightarrow{V}}_{Bg}-2m/s,{\overrightarrow{V}}_{Bg}=6m/s\uparrow$