On the interval {{MATH_77}} the velocity is {{CMD_78}} {{CMD_79}}increasing, because the function {{MATH_80}} is increasing on that interval{{CMD_81}} {{CMD_82}}decreasing, because the function {{MATH_83}} is decreasing on that interval{{CMD_84}} {{CMD_85}}increasing, because the graph of {{MATH_86}} is concave up on that interval{{CMD_87}} {{CMD_88}}decreasing, because the graph of {{MATH_89}} is concave up on that interval{{CMD_90}} {{CMD_91}}increasing, because the graph of {{MATH_92}} is concave down on that interval{{CMD_93}} {{CMD_94}}decreasing, because the graph of {{MATH_95}} is concave down on that interval{{CMD_96}} {{CMD_97}}zero{{CMD_98}} {{CMD_99}}positive and constant{{CMD_100}} {{CMD_101}} {{CMD_102}}