What is the average power developed by a motor as it lifts a 400. -kilogram mass at constant speed through a vertical distance of 10. 0 meters in 8. 0 seconds?.

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.