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**Newton's second law!!**

According to Newton's second law if the resultant force acting on a body is non zero the body moves with an acceleration proportional to the mass of the body, right?Then,

1. Can anyone explain this in an intuitive sense?

2. In solving problems we say that the resultant force is equivalent to the product "ma"(mass times acceleration).How?

3. Can anyone explain the D'Alembert's principle?

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Jrm