A car travels on a straight, level road. a) Starting from rest, the car is going

Question

A car travels on a straight, level road.
a) Starting from rest, the car is going 31 ft/s ( 21 mi/h) atthe end of 5.0s. What is the car's average acceleration inft/s^2.__________
b) In 4.0 more seconds, the car is going 62 ft/s ( 42 mi/h ).What is the car's average acceleration for this timeperiod?______ft/s^2
c) The car then slows to 47 ft/s ( 32 mi/h ) in 3.0s. Whatisthe average acceleration for this time period? _____ft/s^2
d) What is the overall average acceleration for the totaltime?_____ft/s^2

Explanation / Answer

Acceleration = change in velocity / change in time a) 31/5 = 6.2 m/s^2 b) (62-31)/4 = 7.75 m/s^2 c) (47-62) / 3 = -5 m/s^2 d) (47 - 0) / (5+4+3) = 3.91 m/s^2

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