On the interval {{MATH_147}} the velocity is {{CMD_148}} {{CMD_149}}increasing, because the function {{MATH_150}} is increasing on that interval{{CMD_151}} {{CMD_152}}decreasing, because the function {{MATH_153}} is decreasing on that interval{{CMD_154}} {{CMD_155}}increasing, because the graph of {{MATH_156}} is concave up on that interval{{CMD_157}} {{CMD_158}}decreasing, because the graph of {{MATH_159}} is concave up on that interval{{CMD_160}} {{CMD_161}}increasing, because the graph of {{MATH_162}} is concave down on that interval{{CMD_163}} {{CMD_164}}decreasing, because the graph of {{MATH_165}} is concave down on that interval{{CMD_166}} {{CMD_167}}zero{{CMD_168}} {{CMD_169}}positive and constant{{CMD_170}} {{CMD_171}} {{CMD_172}}