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Mechanics › Kinematics

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Numeric Hard suvatfree-fall ~100s

A stone is dropped from rest off a cliff and hits the ground after 3.0 s. How tall is the cliff, in metres? Take g = 9.8 m/s².

Fractions, decimals and π are all understood.

Hints are free to take and they are counted. A correct answer after two hints moves your mastery less than one without — which is the honest way to score it.

Why this question? this skill is new to you; it stretches you slightly; and it needs calibrating — few people have tried it Predicted chance you get it: 29% — the selector aims at 78%.
difficulty fit 0
skill need 0.75
review boost 0
calibration bonus 0.12
recency penalty 0
repetition penalty 0
frustration 0