Hey? (holding up my hand and waving) I can answer that question and you don't even have to pay me a ridiculous amount of money to do so.
The spider was moving very Sloooooooooooooooowly with all of that sticky goo on him. How's that...and it's free!
i would have figured it was moving a 10 m/s/s. (rate of acceleration of a falling object :)