Bob gained (80lbs x 14ft) = 1120 ft-lbs of energy.
Fred gained (110lbs x 14ft) = 1540 ft-lbs of energy
Since they both took the same amount of time, Fred's power (rate
of doing work) was greater than Bob's power (rate of doing work).
Alright let's start this off with our basic equation!
Accerlation (
a) = ?
Initial velocity (
V1)= 60 mph = 88 ft/s (because we HAVE to convert mph to ft/s to match time)
Final velocity (
V2) = 0 ft/s because the car stops
Time (
t) = 4 seconds
a =
![\frac{Final velocity - Initial Velocity}{time}](https://tex.z-dn.net/?f=%20%5Cfrac%7BFinal%20velocity%20-%20Initial%20Velocity%7D%7Btime%7D%20)
a =
![\frac{0 - 88}{4}](https://tex.z-dn.net/?f=%20%5Cfrac%7B0%20-%2088%7D%7B4%7D%20)
a =
![\frac{-88}{4}](https://tex.z-dn.net/?f=%20%5Cfrac%7B-88%7D%7B4%7D%20)
a = -22
Therefore, your acceleration is -22 ft/s² !! Hope this helped and was one of the branliest answers :')
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Hope this helps.