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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematics1-DMedium2 minQB

PhysicsMediumsingle choice

A body starts from rest and moves for $n$ seconds with uniform acceleration $a$ ; its velocity after $n$ seconds is $v$ . The displacement of the body in the last $3$ seconds is:

Options:

Answer:

Solution:

Since $v = an$ , the displacement in $n$ s is $s_{n} = \frac{1}{2} a n^{2} = \frac{v n}{2}$ and in $(n - 3)$ s is $s_{n - 3} = \frac{1}{2} a (n^{2} - 6 n + 9)$ . Subtracting, $s = \frac{1}{2} a (6 n - 9) = \frac{v ( 6 n - 9 )}{2 n}$ . Option A.

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:1-D

⏱ 2mℹ️ Source: QB

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