Professional baseball pitchers deliver pitches that can reach the blazing speed of 100 mph 100 mph (miles per hour). A local team has drafted an up-and-coming, left-handed pitcher who can consistently pitch at 42.01 42.01 m/s ( 94.00 mph ) (94.00 mph) . Assuming a pitched ball has a mass of 0.1432 kg 0.1432 kg and has this speed just before a batter makes contact with it, how much kinetic energy does the ball have?

Simple, don't do it. just don't go to that dock

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.

Ihad this on a test i just recently took on edgenuity and got 100%! the answer is b. no acceleration.