when the lever is pulled, 2 kg of carbon dioxide is ejected at a speed of 60 m/s. the remaining mass of the person, chair, and cylinder is 80 kg. after the ejection, how fast will the chair be moving?

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g