Question

In the figure it is shown that the velocity of lift is $2\text{m}{\text{s}}^{\text{- 1}}$ while string ins winding on the motor shaft with velocity $2\text{m}{\text{s}}^{\text{- 1}}$ and shaft A is moving downward with velocity $2\text{m}{\text{s}}^{\text{- 1}}$ with respect lift, then find out the velocity of block B

• A. $2\text{m}{\text{s}}^{\text{- 1}}\uparrow$
• B. $2\text{m}{\text{s}}^{\text{- 1}}\downarrow$
• C. $4\text{m}{\text{s}}^{\text{- 1}}\uparrow$
• D. None of these

Answer 1

The correct option is A $2\text{m}{\text{s}}^{\text{- 1}}\uparrow$

Lift $=2$ m/s

velocity $=2$ m/s

down ward velocity $=2$ m/s

$\therefore$ velocity of Block $B=\uparrow 2+2\uparrow -2\downarrow$

$=4-2$

$=4-2$

$=2m/s\uparrow$