Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeEasy2 minPYQ_2020

PhysicsEasysingle choice

Two trains are moving in the same direction along parallel tracks. One of them is $200 m$ long travelling with a velocity of $20 m s^{- 1}$ . The second one is $800 m$ long travelling with a velocity of $7.5 m s^{- 1}$ . The time taken for the first train to overtake the second is

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Answer:

Solution:

From the figure, the relative displacement is

$s_{r e l} = (800 + 200) m = 1000 m$

$υ_{r e l} = υ_{1} - υ_{2} = (20 - 7.5) m s^{- 1}$

$= 12.5 m s^{- 1}$

$∴ t = \frac{s_{r e l}}{υ_{r e l}} = \frac{1000}{12.5} = 80 s$

Subject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: PYQ_2020

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