13. abrasion erodes the desert surface by *
a. creating blowouts
b. cutting and polishing exposed rock surfaces
c. depositing loess across the landscape
d. creating a stony surface layer

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)