In figure shown velocity of lift is 2,m / s while string is winding on motor shaft with velocity 2,m

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4-1.Newton's Laws of Motion

hard

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 a velocity of $2\,m / s$, then find out the velocity of block $B -$

A

$2\,m / s \uparrow$

B

$2\,m / s \downarrow$

C

$4\,m / s \uparrow$

D

None of these

Solution

(d)

$\overrightarrow{ v }_{ B , l }=4\,m / s \uparrow$

$\overrightarrow{ v }_{ B , l }=\overrightarrow{ v }_{ B , g }-\overrightarrow{ v }_{i, g }$

$4\,m / s =\overrightarrow{ v }_{ B , g }-2\,m / s$

$\Rightarrow \overrightarrow{ v }_{ B , g }=6\,m / s \uparrow$

Standard 11

Physics

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