Antwort
1.0 s.
Erklärung
Starting from rest, distance is (1/2)gt^2. Solving 4.9 = 4.9t^2 gives t = 1.0 s.
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A ball is dropped from rest and falls 4.9 m. With g = 9.8 m/s^2 and no air resistance, how long is the fall?
Lernkarte aus dem Deck Gaokao essentials: original practice.