according to newtons first law of motion a mass in motion remains in motion unless acted upon by some force true or false

According to Newton's first law of motion, the answer would be true.

The Newton's first law of motion states that a body will either continue to rest or in motion unless an external force acts on it.

The body represents a mass. Hence, that a mass in motion would remains in motion unless acted upon by some force represents a version of Newton's first law of motion.

More on Newton's law can be found here: link