Position–Time Graph

x-t graph plots position against time. Slope at any point = instantaneous velocity.

A horizontal line means rest (v = 0). A straight inclined line means uniform velocity.

A curved line (parabola) means constant acceleration — x(t) = x₀ + v₀t + ½at².

Concave-up parabola → a > 0; concave-down → a < 0.

Two objects meet when their x-t curves intersect.