A parachutist bails out and freely falls 56 m. Then the parachute opens, and thereafter she decelerates at 1.7 m/s2. She reaches the ground with a speed of 3.2 m/s.
(a) How long is the parachutist in the air?
(b) At what height does the fall begin?

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Why are graphs useful when interpreting data

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?