SOLUTION: a car is travelling with a speed of 90km/hr reduces its speed 36km/hr.while travelling a distance of speed 100 m. find the deceleration produced?

Question 661051: a car is travelling with a speed of 90km/hr reduces its speed 36km/hr.while travelling a distance of speed 100 m. find the deceleration produced?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
a car is travelling with a speed of 90km/hr reduces its speed 36km/hr.while travelling a distance of speed [sic] 100 m. find the deceleration produced?
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a car is travelling with a speed of 90km/hr reduces its speed 36km/hr.while travelling a distance of 100 m. find the deceleration produced?
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90 km/hr = 25 m/sec
36 km/hr = 10 m/sec
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The avg speed over the 100 meters = (25 + 10)/2 = 17.5 m/sec
t = 100/17.5 = 40/7 seconds
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a = (10 - 25)/(40/7) = -21/8 m/sec/sec
a = -2.625 m/sec/sec

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