Suppose that you and two classmates are discussing the design of a roller coaster. one classmate says that each summit must be lower than the previous one. your other classmate says this is nonsense, for as long as the first one is the highest, it doesn't matter what height the others are. what do you say

The law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '

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.

Acar of mass 800kg is moving at a speed of 2.2m/s.