Question

prove how 2 law of motion contains 1 law of motion

Answer 1

Newton's first law states that a body stays at rest if it is at rest and moves with a constant velocity if already moving, until a net force is applied to it. In other words, the state of motion of a body changes only on application of a net non-zero force.
Newton's second law states that the net force applied on a body is equal to the rate of change in  its momentum.
 
So, if the net force, F is zero, change in the value of v is be zero i.e., a body at rest will be at rest and a body moving with constant velocity will continue with the same velocity, until a net force is applied. This conclusion is similar to the Newton’s first law of motion.
 
Thus, we can derive Newton’s first law of motion using Newton’s second law of motion.
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