5. A catapult has two rubber arms, each with a square cross-section with a width 4 mm and length 300 mm. In use, its arms are stretched to three times their original length before release. Assume that the elastic modulus of rubber is 10-3 GPa and that the value does not change when the rubber is stretched. How much energy is stored in the catapult just before release

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.