The shell command
"/var/www/html/filter/tex/mimetex.linux" -e "/var/www/moodledata/filter/tex/d2cf8cb7adfd4fcce248e0b70e7a70f5.gif" -- '\Large v_t=v_t-(v_t-v_0)e^ \frac{-bt}{m} '
returned status = 127
Image not found!
Please try the debugging script