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PhysicsKinematics1-DEasy2 minPYQ_2023

PhysicsEasysingle choice

An object moves with speed $v_{1}, v_{2}$ and $v_{3}$ along a line segment $A B, BC$ and $C D$ respectively as shown in figure. Where $A B = BC$ and $A D = 3 A B$ , then average speed of the object will be:

Options:

Answer:

Solution:

Consider,
$AB = x$
$BC = x$

$2 x + CD = 3 x \Rightarrow CD = 3 x - 2 x = x$
Average speed of the object $< v >$
$= \frac{Total distance}{Total time}$
$< v >= \frac{3 x}{\frac{x}{v _{1}} + \frac{x}{v _{2}} + \frac{x}{v _{3}}} = \frac{3 v _{1} v _{2} v _{3}}{v _{2} v _{3} + v _{1} v _{3} + v _{1} v _{2}}$

Stream:BITSATSubject:PhysicsTopic:KinematicsSubtopic:1-D

⏱ 2mℹ️ Source: PYQ_2023

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