How is wind direction indicated on a weather map ?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

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?

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost