What is the problem in this article? what solution does the article propose? (site 1)

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

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

The ph is the a.independent variable b.the dependent variable c.control group