The elastic potential energy that stored in the spring when it is stretched by 0.2 m is equal to :
1) 1J
2) 2J
3) 5J

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