On the interval {{MATH_42}} the velocity is {{CMD_43}} {{CMD_44}}increasing, because the function {{MATH_45}} is increasing on that interval{{CMD_46}} {{CMD_47}}decreasing, because the function {{MATH_48}} is decreasing on that interval{{CMD_49}} {{CMD_50}}increasing, because the graph of {{MATH_51}} is concave up on that interval{{CMD_52}} {{CMD_53}}decreasing, because the graph of {{MATH_54}} is concave up on that interval{{CMD_55}} {{CMD_56}}increasing, because the graph of {{MATH_57}} is concave down on that interval{{CMD_58}} {{CMD_59}}decreasing, because the graph of {{MATH_60}} is concave down on that interval{{CMD_61}} {{CMD_62}}zero{{CMD_63}} {{CMD_64}}positive and constant{{CMD_65}} {{CMD_66}} {{CMD_67}}