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Some Acceleration Practice Problems

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3. If I were to accelerate at this rate for another ninety seconds, how fast would I be going? ... What formula relates all three (velocity, acceleration and time) ... – PowerPoint PPT presentation

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Title: Some Acceleration Practice Problems


1
Some Acceleration Practice Problems
2
1. 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

Skip 2 ?
3
3. 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)
4
4. 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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