Which of the following statements are true? Wave height is the distance from its highest point (crest) to its lowest point (trough). Wave length is the distance from crest to crest. Wave oscillation to calculated by multiplying the wave height times its length. Both the first and second answers are correct.

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