A40kg rock falls off a cliff that is 50 meters high. how fast is the speed of the rock when it hits the ground

Which statement best describes how private industry decides where to spend the money on research and development

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.