(Here are some convenient British system conversions.) A car travels on a straig

Question

(Here are some convenient British system conversions.) A car travels on a straight, level road.
(a) Starting from rest, the car is going 40. ft/s (27 mi/h) at the end of 5.0 s. What is the car's average acceleration in ft/s2?
ft/s2
(b) In 4.0 more seconds, the car is going 80 ft/s (55 mi/h). What is the car's average acceleration for this time period?
ft/s2

(c) The car then slows down to 60 ft/s (41 mi/h) in 3.0 s. What is the average acceleration for this time period?
ft/s2

(d) What is the overall average acceleration for the total time?
ft/s2

Explanation / Answer

a)a=(v-u)/t=40/5=8ft/s/s b)a=(80-40)/4=10ft/s/s c)a=(80-60)/3=6.66ft/s/s d)a=(60-0)/15=5ft/s/s

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