def write_s_formula(self):
    ds_dt = TexMobject('ds', '\\over\\,', 'dt')
    ds_dt.set_color_by_tex('ds', DISTANCE_COLOR)
    ds_dt.set_color_by_tex('dt', TIME_COLOR)
    ds_dt.next_to(self.graph_label, UP, LARGE_BUFF)
    v_t = self.graph_label.get_part_by_tex('v(t)')
    arrow = Arrow(ds_dt.get_bottom(), v_t.get_top(), color=WHITE)
    self.play(Write(ds_dt, run_time=2), ShowCreation(arrow))
    self.wait()
def write_s_formula(self):
    ds_dt = TexMobject('ds', '\\over\\,', 'dt')
    ds_dt.set_color_by_tex('ds', DISTANCE_COLOR)
    ds_dt.set_color_by_tex('dt', TIME_COLOR)
    ds_dt.next_to(self.graph_label, UP, LARGE_BUFF)
    v_t = self.graph_label.get_part_by_tex('v(t)')
    arrow = Arrow(ds_dt.get_bottom(), v_t.get_top(), color=WHITE)
    self.play(Write(ds_dt, run_time=2), ShowCreation(arrow))
    self.wait()