AP Physics 1hardmcq1 pt
A ball thrown upward at 20 m/s passes a ledge at 15 m height on the way down at time
A.3.0 s
B.1.0 s
C.2.0 s
D.4.0 s
Explanation
Core Concept
The larger root of 15 = 20t − 5t² (t² − 4t + 3 = 0) is t = 3.0 s, the downward crossing.
Correct Answer
A3.0 s
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