# Question Video: Finding the Average Velocity of a Particle Moving in a Straight Line given a Relation between Its Position and Time Mathematics • Third Year of Secondary School

A particle is moving in a straight line such that its position 𝑟 metres relative to the origin at time 𝑡 seconds is given by 𝑟 = (𝑡² + 3𝑡 + 7). Find the particle’s average velocity between 𝑡 = 2 s and 𝑡 = 4 s.