The position of a vehicle along a straight highway is modeled by kilometers

MATHEMATICS · Subjective · A Level · Mathematics · Kinematics · Kinematics

Problem

The position of a vehicle along a straight highway is modeled by

s(t)=10-2t^{3}

kilometers, where

t

is in hours. Decide whether the vehicle is moving in the positive or negative direction at

t=1.5

hours and briefly justify your answer.