Question 716243: Velocity and acceleration. Pls help me solve, a vehicle travelling at 90km/hr accelerates at 1.8m/s, calculate the distance it travels before it stops
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! a vehicle travelling at 90km/hr accelerates at 1.8m/s, calculate the distance it travels before it stops
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acc must be negative, or it won't stop.
Also, acc = 1.8 m/sec/sec, not m/sec
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v = 90 km/hr = 90000 m/3600 sec = 25 m/sec
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time to stop = 25/1.8 = 125/9 seconds
The average speed is 1/2 of 25 m/sec (25 m/sec at t = 0, 0 m/sec when stopped)
distance = vt/2 = 25*(125/(9*2)) = 173.6111... meters
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