A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s2. Find how far the car will go before it is brought to rest?
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Answer:
The car will travel 625 metres.
Explanation:
Initial speed = u= 90 km/h = 25 m/sec
Final speed = v = 0 m/sec
Acceleration = a = -0.5 m/sec²
Distance = S
Applying the third equation of motion,
v²-u² = 2aS
0-25² = 2×-0.5×S
-625 = -1S
S = 625 metres
Therefore the car will travel 625 metres before coming to rest.
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