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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematics1D MotionMedium2 minQB

PhysicsMediuminteger

A car moving at 72 km/hr comes to rest in 16 m after brakes are applied, if same car moving at 36 km/hr then it may come to rest after moving a distance (in m) equal to :-

Answer:

Solution:

$72 km/hr = 20 m/s, 36 km/hr = 10 m/s$

Same braking force gives the same retardation, and $v^{2} = 2 a d \Rightarrow d \propto v^{2}$

$d_{2} = 16 \times (\frac{36}{72})^{2} = 16 \times \frac{1}{4} = 4 m$

Answer: 4

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:1D Motion

⏱ 2mℹ️ Source: QB

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