What can we say about the velocity of a car which has negative acceleration in the x-direction? multiplechoice : 1) the x-component of it's velocity is decreasing. 2) the x-component of its velocity is positive. 3) it is slowing down. 4) the x-component of its velocity is negative. 5) it is speeding up. 6) the x-component of it's velocity is increasing.

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).