Mini-Quiz: Overview of Gravity Equations for Objects Projected Upward

1. For an object projected upward, when t = 0, what does v equal?

   v = viCorrect. You know about gravity equations. v = 0Sorry, not correct. Try another button. v = −viGood try, but not right. Select another answer.

2. What is the equation for the maximum height of a ball thrown upward at 10 m/s?

   ym = (v2 − vi2)/2gOops! Wrong answer. Re-read the question and try again. ym = −vi2/2gThat is Correct. You know your Physics. ym = gt2/2 + vitSorry, not correct. Try another button.

3. If an object is thrown upward at −40 ft/s, what is the elapsed time when v = −8 ft/s?

   t = (−8 − 40)/32 = −1.5 secondsGood try, but not right. Select another answer. t = (8 + 40)/32 = 1.5 secondsOops! Wrong answer. Re-read the question and try again. t = (−8 + 40)/32 = 1 secondCorrect. You know about gravity equations.

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