Four ducks entered a race across the pond. One of the ducks was a decoy (a fake, plastic duck that does not move). Which duck was the decoy?

Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature

Atruck travels at an average speed of 70 km/hr. if it travels 100 km in the first hour, how far will it go the second hour of a 2 hour trip? if you could also give me the steps that would great.

What is the momentum of a 47-gram tennis ball that is traveling at 40 m/s