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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematics1-DMedium2 minQB

PhysicsMediumsingle choice

The velocity of a car travelling on a straight road is given by $v = 6 + 8 t - t^{2}$ , where $v$ is in metres per second and $t$ in seconds. The instantaneous acceleration at $t = 4.5$ s is:

Options:

Answer:

Solution:

$a = \frac{d v}{d t} = 8 - 2 t$ , so at $t = 4.5$ s, $a = 8 - 9 = - 1 m / s^{2}$ . Option C.

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:1-D

⏱ 2mℹ️ Source: QB

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