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A bus was moving with a speed of 54 km/h. On applying brakes it stopped in 8 seconds. Calculate the acceleration.
Here initial velocity $u=54\ km/h=54\times\frac{5}{18}=15\ m/s$
Time $t=8\ sec.$
Final velocity of the bus $v=0$
Let $a$ be the acceleration.
On using the equation $v=u+at$
Or $0=15+a\time8$
Or $8a=-15$
Or $a=-\frac{15}{8}\ m/s^2$
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