Let $s ( t ) = \int _ { 1 } ^ { t ^ { 2 } - 3 t } ( u + 2 ) e ^ { \sqrt [ 4 ] { u } } d u$

Essay

Let $s ( t ) = \int _ { 1 } ^ { t ^ { 2 } - 3 t } ( u + 2 ) e ^ { \sqrt [ 4 ] { u } } d u$ be the position function of a particle. When does the particle stop?