Formulae (Math) Displacement-time graphs. displacement time s(m)' gradient Velocity = No change in displacement object is stationary. = = t = , t(s) s(m) Displacement increases at a constant rate over Object moves with constant velocity . tis) 1 s(m) Displacement as time is increasing . increases and object is > t(S) at Velocity is greater rate increasing accelerating. s time , V Acceleration - a = acceleration time graphs += time a(ms - 2) Zero acceleration - constant velocity & t(S) ↑ alms-y Positive acceleration > - increase in Velocity t(S) alms- Negative acceleration (deceleration) tIS) - decrease in Velocity