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 3 years ago
You are riding your bicycle at a speed of 12 ft/2.
Four seconds later, you come to a complete stop. Find the acceleration of your bicycle.
Help! and explain it too please?
 3 years ago
You are riding your bicycle at a speed of 12 ft/2. Four seconds later, you come to a complete stop. Find the acceleration of your bicycle. Help! and explain it too please?

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mcgyver
 3 years ago
Best ResponseYou've already chosen the best response.0\[v _{f}=v _{i}+at\] 0=12+a(4) 3ft/s=a

Valpey
 3 years ago
Best ResponseYou've already chosen the best response.1Acceleration is the change in speed (or velocity) over time. In this case you decelerated from 12 feet per second to zero feet per second across a period of four seconds. On average over those four seconds your speed went down by 3 feet per second for each of those seconds. Hence your acceleration was negative three feet per second per second or: \[3ft/s^{2}\]

Valpey
 3 years ago
Best ResponseYou've already chosen the best response.1If your acceleration was perfectly constant over those four seconds, your speed at time 0 was 12ft/s; at time 1 was 9ft/s; at time 2 was 6ft/s; at time 3 was 3ft/s; and at time 4 was 0ft/s.
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