Some Acceleration Practice Problems

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Some Acceleration Practice Problems
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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

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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)
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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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