Question

which pieces of information are necessary to describe an objects motion?
position and direction
position, direction, and speed
direction and speed
position and speed

Explanation:

To describe an object's motion, we need to know its position (where it is), direction (where it is going), and speed (how fast it is moving). Position alone (as in just position and direction or position and speed) doesn't fully describe motion as speed gives the rate of change. Direction and speed alone lack the starting - point (position) information.

Answer:

position, direction, and speed