本题目来源于试卷: Space Time & Motion A.1 Kinematics，类别为 IB物理学
[单选题]
The diagram below shows a car of mass m descending a slope. The car, initially at rest, covers a distance of $27\,m$ in $3.0\,s$
The magnitude of the acceleration is given by
A. $3.0\,m\,s^{-2}$
B. $6.0\,m\,s^{-2}$
C. $9.0\,m\,s^{-2}$
D. $81\,m\,s^{-2}$
参考答案: B
本题详细解析:
ExplanationExplanation:
From the equation of motion s=vt+$\frac{1}{2}at^2$,
initially the velocity, u is zero.
u is zero.
⇒a=$\frac{2\,s}{t^2}$ Substituting Substitutingt=2s$\frac{(2)(27.0\,m)}{3^2}$=6.0 $\,m\,s^{-2}$
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