alleryA ball is thrown straight up at 20 m/s (g = 10 m/s squared). How long until it returns to the thrower's hand?
A4 s
B2 s
C6 s
D8 s
Answer & Solution
Correct answer: A. 4 s
Rise takes u / g = 2 s and the fall takes the same time, so the flight lasts 4 s.
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