2. Name two of the five alternative principles of fitness. What important role does each play in an exercise regiment? (4 points)
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What are chlorofluorocarbons and what impact do they have on the atmosphere?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s