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双语习题 On a horizontal surface, an object of mass 5 kg moves with uniform velocity

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双语习题 On a horizontal surface, an object of mass 5 kg moves with uniform velocity

双语习题

On a horizontal surface, an object of mass 5 kg moves with uniform velocity of 2 m/s when a force of 4 N is applied．What is its acceleration when the force is increased to 12 N?

试题答案

答案：

解析：

Frictional force f＝4 N

Resultant force F＝ma－f＝12-4＝8 N

Therefore, acceleration a＝8/5＝1.6 m/s2

标签：双语习题massofkg

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