Find the initial velocity of a car which is stopped in $10\ seconds$ by applying brakes. The retardation due to brakes is $2.5\ m/s^2$.

Academic Physics NCERT Class 9

Here given, Time $t=10\ sec.$

Final velocity $v=0$

Retardation $a=-2.5\ m/s^2$

Let $u$ be the initial velocity.

On using the equation of motion $v=u+at$

$0=u+10\times(-2.5)$

Or $u=25\ m/s$

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Updated on: 10-Oct-2022

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