Question

Is newton's first law is a special case of second law?explain.please do fast tommorow is my test.

Answer 1

Yes. First law defines inertia, namely inability of a mass to change its state whether at rest or in uniform motion unless acted upon by an external force. The measure of inertia is the mass of the body. That is the first law. 
As per the second law force=mass* acceleration,which takes place in the direction of force. Imagine a trivial case when force is zero. The acceleration has to be zero since the mass is never zero. In other words first law is a trivial case of second law when applied force is zero.