Starting from rest a car moves with uniform acceleration and attains a velocity of 72 km/hin 15 s. It then moves with uniform
speed for 20 s and is then brought to rest in 10 s under retardation. Find total distance travelled using velocity - time graph .
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Explanation:
The acceleration of the body is the change in its velocity divided by the elapsed time.
Given: the elapsed time is 5 minutes or 300 seconds. Its initial velocity is zero and its final velocity is 16 KPH.
Solving for is acceleration:
acceleration = (final velocity - initial velocity) / 300 s
acceleration = (16 KPH - 0) / 5 min
acceleration = 3.2 km/h/min
acceleration = (3200 m/3600 s) / 60 s
acceleration = 8/9/60 m/s^2
acceleration = 8/(9*60) m/s^2
acceleration = 0.0148 m/s^2
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