Answer:
Continue to move at 30mph
Step-by-step explanation:
Newton's first law states that a body continues to remain at rest or in uniform motion unless an external force acts on the object .
Here given that The object is moving at 30 mph is acted with a net force = 0
Since net force = 0 there will be no external force
By the first law it continues to remain in its state of uniform motion
Here the car performing a uniform motion with uniform speed of 30mph
Hence it continues to do so