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The Equations of Motion

A toy car ini...

Question

A toy car initially moving with a uniform velocity of $18 m h^{- 1}$ comes to a stop in 2 s. Find the retardation of the car in S.I.units.

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Solution

Given
initial velocity = 18 kmph=5m/s
Final velocity=0
time =2sec

Applying
v=u+at

0=5+at
-5=2a
So retardation =2.5 $m / s^{2}$

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