Hydrogen gas (h2) can be found in trace amounts in earth’s atmosphere. which of these statements describes a physical property of hydrogen? select one: a. hydrogen is found in acids. b. hydrogen gas is highly flammable. incorrect c. hydrogen reacts with oxygen to form water. d. hydrogen gas is less dense than oxygen gas.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.