Answer to Question #340376 in Mechanics | Relativity for Amber

Question

The position of a particle is given by r(t) = -3.1 t i + 0.72 t4 j m, where t is in seconds. At t = 1.9 s, what is the magnitude of the particle’s acceleration?

Answer 1

$a=\ddot r=8.64t^2\vec j,$

$a(t)=31.2\vec j.$