Longitudinal research is more accurate than cross-sectional research when it comes to measuring development of intelligence over the decades, but there are three drawbacks tothis research design. which of the following is not one of the drawbacks?
a)an inability to determine continuity and discontinuity of intellectual development
b)unusual events affecting each cohort, and more mundane changes making the data on one cohort less relevant to later cohorts
c)the loss of some participants across time, which could skew the results
d)repeated testing provides practice, which could improve scores

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s