If an object is moving at a constant speed in one direction, what is needed to change its speed or direction?

Newton's 2nd law basically says that an object accelerates when a net forces act on it and velocity is speed in a particular direction.If a body accelerates, there is a change in velocity which means that either the speed or direction or speed and direction of the object changes.

A force is required to change speed and direction                                                 (Newton's First Law of Motion.)

4. 50x10= 500m/s 5. 52m/s

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.