Title: Some Acceleration Practice Problems
1Some Acceleration Practice Problems
21. While drag racing out of our school parking
lot, I time myself at a speed of 40 meters per
second seven seconds after starting. What was my
acceleration during this time?
- Acceleration vf vi
- time
- Acceleration 40 m/s 0 m/s
- 7 s
- 40 m/s
- 7 s
- 5.7 m/s/s or 5.7 m/s2
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33. If I were to accelerate at this rate for
another ninety seconds, how fast would I be
going?
- Acceleration vf vi
- t
- We know that a 5.7 m/s/s, vi 0 m/s, and t
97 s, so we need to solve for vf. - A vf
- t
- So vf 550 m/s
vf at
vf (5.7m/s/s)(97s)
44. If I were to drop a ball out of my car while I
was traveling at a velocity of 25 m/s, and it
underwent a deceleration of 2.0 m/s/s while
rolling to a stop, how long would it take for it
to stop?
- What formula relates all three (velocity,
acceleration and time)? - a vf vi But we have to solve for t!
- t
- So t vf
- a
- Therefore, t 25 m/s
- 2.0 m/s/s
t 12.5 s
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