Mini-Quiz: Gravity Velocity Equations for Objects Projected Upward

1. If vi = −19.6 m/s, what is the velocity at t = 5 s?

   29.4 m/sCorrect. You know about gravity equations. −29.4 m/sSorry, not correct. Try another button. 9.8 m/sGood try, but not right. Select another answer.

2. If vi = −20 ft/s, what is the velocity at y = −2 ft?

   v = ±√(128 + 400)Oops! Wrong answer. Re-read the question and try again. v = −√(128 − 400) and v = √(−128 + 400)Sorry, not correct. Try another button. v = ±√(−128 + 400)That is Correct. You are smart.

3. If vi = −10 m/s and g = 9.8 m/s2, what is v when y = 5 m?

   v = ±√(98 + 100)Good try, but not right. Select another answer. v = √(98 + 100)Correct. You know about gravity equations. v = √(98 − 100)Oops! Wrong answer. Re-read the question and try again.

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