Physics help from experts.
Relative velocity is the vector difference between the velocities of two objects viewed from an arbitrary frame of reference.
When an airplane starts to fly into a wind, its speed relative to the ground decreases, and when it starts to fly with a wind its ground speed increases. What happens to the ground speed of an airplane if a wind starts to blow at 90 degrees to the direction it is pointing? Its ground speed
b. stays the same
d. could do any of the above