Which of the following describes a risk associated with the use of hydropower as an energy source? a the use of hydropower often changes the natural flow of water through an ecosystemb the use of hydropower uses a lot of fuel to release a small amount of energyc 'tuoh' produces water pollutiond 'tuoh' poses a that to birds and bats that may fly into the turbines

Which of the following describe possible scenarios? a) an object has zero instantaneous velocity and non-zero acceleration. b) an object has negative acceleration and is speeding up. c) an object has positive acceleration and constant velocity. d) an object has positive velocity and zero acceleration. e) an object has increasing positive position and negative velocity. f) an object has decreasing positive position and negative acceleration.