Whenever you work a physics problem you should get into the habit of thinking about whether the answer is physicallyrealistic. Think about how far off the ground a typical small truck is. Is the answer to Part B physically realistic?Select the best choice below. a. No, typical small pickup truck springs are not large enough to compress 0.61{\rm m}.b. Yes, typical small pickup truck springs can easily compress 0.61{\rm m}

a. No, typical small pickup truck springs are not large enough to compress 0.61{\rm m}.

Explanation:

It really doesn't matter for any of the questions that you've listed.

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.