Mini-Quiz: Gravity Time Equations for Objects Projected Upward

by Ron Kurtus (revised 7 February 2011)

Take this Mini-Quiz to check your understanding of the lesson material.

1. If the initial velocity is −32 ft/s, how long does it take for the object to reach +32 ft/s?

t = (32 − 32)/32 = 0 seconds

t = (32 + 32)/32 = 2 seconds

t = 32 + 32/32 = 33 seconds

2. If vi = −20 m/s, which equation shows the time it takes the object to move upward and reach 30 m above the starting point?

t = [−20 (20)2 + 2*9.8*30]/9.8

t = [20 + (20)2 + 2*9.8*(30)]/9.8

t = [20 (20)2 + 2*9.8*(30)]/9.8

3. If vi = −98 m/s and y = +196 m, what is the elapsed time?

21.8 s

−21.8 s

2.25 s

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

Calculations help to verify the concept

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