The character is drawn about 33 pixels tall. If he's of average height, then that means that 1 pixel maps to about 2 1/8 in (5.39 cm). The pulley above him is drawn about 431 pixels above ground, which would then be about 76 ft (23.22 m) up.

At 14% of Earth's gravity, gravitational acceleration on Titan would be at about 4.5 ft (1.37 m) per squared second.

That all means that he hits the ground at about 17.8 mph (28.7 kph) or less. That would be the speed associated with a normal fall of about 10.5 ft (3.2 m).

Tags: dweebery, xkcd

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