On planet {{MATH_1}} a stone is thrown vertically into the air at an initial velocity of {{MATH_2}}. The height {{MATH_3}} (in feet) of the stone above the ground after {{MATH_4}} seconds is {{MATH_5}} {{CMD_6}} {{CMD_7}} Find the velocity function {{MATH_8}} and the acceleration function {{MATH_9}}. {{ENV_10}} {{CMD_11}} With what speed will the stone strike the ground? {{CMD_12}} Find the time, {{MATH_13}}, when the stone strikes the ground. {{CMD_14}} {{CMD_15}} Find the time, {{MATH_16}}, when the stone strikes the ground, by solving the equation {{MATH_17}} and evaluate {{MATH_18}}.