What does a flat, horizontal line mean on a DISTANCE-time graph?
Speeding up
Travelling at a constant speed
Not moving (motionless, stationary)

Explanation:

A straight horizontal line on a speed-time graph means that speed is constant. It is not changing over time. A straight line does not mean that the object is not moving!

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conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.