美国2021年物理杯赛真题 PHYSICS BOWL 2021 (id: c837649cc)

本题目来源于试卷: 美国2021年物理杯赛真题 PHYSICS BOWL 2021，类别为 美国物理杯赛(Physics Bowl)

[单选题]
A rock that has a mass of 12 kg is sliding on a rough, horizontal surface. It has 24 J of kinetic energyand the friction force on it is a constant 0.50 N. What distance will it slide before coming to rest?

A. 2.0m
B. 12m
C. 24m
D. 36m
E. 48m


参考答案:  E


本题详细解析:
$KE=\frac{1}{2} mv^2$ ; $v^2=v_0^2+2a ∆x$ ;  $\vec F=m \vec a$

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