A ball is dropped from rest. What is its speed after 4 seconds? (Take g as 10m/s/s)
- 80m/s.
- 40m/s.
- 20m/s.
Explanation from PART66Online
For free fall from rest, speed v = g x t = 10 x 4 = 40 m/s. Velocity increases linearly with time under constant gravitational acceleration, so the 80 m/s distractor (which doubles g) is incorrect.
B
Bidan01 asked · 19 Aug 2022
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