A car is moving with a velocity of 25 m/s, driver applies brakes and it comes to rest in 4 seconds. Calculate its acceleration and distance travelled after brakes are applied.
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In this case, we know u = 25m/s, v = 0, t = 5s and we want to find acceleration, a, so we use equation (3)
......(given)
v = u + at
s is distance, u is initial velocity, v is final velocity, a is acceleration and t is time
0 = 25 + 5a. (from given)
a = -25/5 = -5m/s^2
So the acceleration is -5m/s^2 (negative meaning retardation)
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