Aball is thrown straight up from a student's hand. her hand is 2.0 m above the ground. the ball leaves the student's hand with a speed of 15 m/s how long is the ball in the air before it hits the ground?

The biome pictured above is found in areas such as kenya and south africa. the land is grass-covered with very few trees and gazelles and other grazers are common here. why does this biome have a low population of trees? a) large grazing animals destroy the trees. b) it is a deforested rainforest with poor soil. c) it has high temperatures and low precipitation. d) it has a long rainy season followed by flooding.

The double-blind procedure is most for a.random assignment b.the placebo effect c.operational definitions replication d. standard deviations

Which of the following activities would conserve the most energy? installing a dimmer switch on a light using a blender instead of a food processor hanging clothes to dry on a clothesline instead of ironing them opening a window instead of turning on the air conditioning setting your computer's screen saver to turn on after less time has elapsed