What is the correct order of processes in the accretion of planetesimals?Masses of matter form around dust grain, masses of matter collide, and atoms and molecules are added to dust grain. Masses of matter collide, masses of matter form around dust grain, and atoms and molecules are added to dust grain. Atoms and molecules are added to dust grain, masses of matter form around dust grain, and masses of matter collide. Masses of matter collide, atoms and molecules are added to dust grain, and masses of matter form around dust grain.

It is the areas with lines. this may sound a little confusing, but i hope it !

It is increased due to the doppler effect. (apex)

Distance covered, s = 8ft - 4ft = 4 ftinitial velocity, u = 34 ft/sthe acrobat is moving upwards and therefore, a = -g = -9.81 m/s^2 = 32.19 ft/s^2applying equation of motion; s = ut -1/2gt^2then,4 = 34t -1/2*32.19t^24 = 34t - 16.095t^2rearranging; -16.095t^2 + 34t - 4 = 0solving the quadratic equation; t = {-34 +/- sqrt [34^2 - 4(-16.)]}/2(-16.095) = 1.06 +/- 0.93 = 0.13 or 1.99the acrobat will take 0.13 seconds to be at 8 ft above the ground. additionally, once at the maximum height, the acrobat will move down and be at the same spot (that is height) after 1.99 seconds moving down.