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PhysicsKinematics1-DEasy2 minPYQ_2023

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A vehicle travels $4 km$ with speed of $3 km h^{- 1}$ and another $4 km$ with speed of $5 km h^{- 1}$ , then its average speed is :

Answer:

Solution:

Average speed in this case is given by, $\frac{2}{v_{a v}} = \frac{1}{v_{1}} + \frac{1}{v_{2}}$

$\Rightarrow \frac{2}{v_{a v}} = \frac{1}{3} + \frac{1}{5}$

$\Rightarrow \frac{2}{v_{a v}} = \frac{8}{15}$

$\Rightarrow v_{a v} = \frac{15}{4} = 3.75 km h^{- 1}$

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:1-D

⏱ 2mℹ️ Source: PYQ_2023

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