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Mechanics › Work and energy

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Numeric Moderate kinetic-energy ~65s

What is the kinetic energy, in joules, of a 4 kg object moving at 5 m/s?

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 consolidates something easier; and it needs calibrating — few people have tried it Predicted chance you get it: 50% — the selector aims at 78%.
difficulty fit 0.058
skill need 0.75
review boost 0
calibration bonus 0.12
recency penalty 0
repetition penalty 0
frustration 0