How can we tell from a distance-time graph if an object is stationary?

How can we tell from a distance-time graph if an object is moving at constant speed?

What does the gradient of a distance-time graph tell us?

How do we calculate the speed of an object?

What is the difference between speed and velocity?

What is acceleration and what is its unit?

How can we calculate the acceleration of an object?

What is deceleration?

What can we say of a velocity-time graph is a horizontal line?

What does the area under a velocity-time graph represent?