A particle moves along a line so that its velocity (in meters per second) is given by
MATHEMATICS · Single correct · A Level · Mathematics · Kinematics · Kinematics
Problem
A particle moves along a line so that its velocity (in meters per second) is given by v(t)=t2−4t+3, where t is measured in seconds. At what time does the particle’s acceleration change sign?
(a) t=1
(b) t=4
(c) t=2
(d) The acceleration does not change sign for any real t.