1 Kinematics
A stone is dropped from a building, and 2 seconds later another stone is dropped. (Both are dropped from rest.) How far apart are the two stones by the time the first one has reached a speed of 30m/s?
1) 80m 2) 100m 3) 40m 4) 20m
Solution
302=2×10×s s=45m 30 ⇒ t=3sec.
40m
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