What does total distance represent?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

Many science fiction movies and tv shows have detected using a nuclear weapon to destroy astroids what problems does plait see with this plan