Question

fill in the blank question
an object moves at a constant

unless an

force acts on it. this is a statement of newtons first law of motion.

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Explanation:

Newton's first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. So, the first blank is related to the state of motion (speed and direction combined is velocity) and the second blank is about an un - balanced force.

Answer:

velocity; unbalanced