The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill?

a) 91.5 m
b) 79.2 m
c) 80.0 m
d) 68.5 m

Heat from the sun reaches earth to a. radiation b. convection c. conduction

Select the correct answer. anna will wear a black dress when she attends het cousin's wedding. which color(s) does the dress absorb? a. all colors b. no colors c. red and green d. white

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15