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ZX-ACF7107B442024年12月A卷 · 第 4 题
2024年12月A卷 · 原库模块 2 · Q4 原库参考解析
\( 49=\frac{2K}{v^2} \)
For an object with a mass of 49 kilograms, the given equation relates the kinetic energy K, in joules, of the object to the object's speed v, in meters per second, where K and v are positive. Which equation correctly expresses this object's speed, in meters per second, in terms of the object's kinetic energy, in joules?
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