Find the potential difference av, required to stop an electron (called a 'stopping potential) moving with an initial speed of 1.89 x 10' m/s. (b) would a proton traveling at the same speed require a greater or less magnitude potential difference? explain this answer has not been graded yet (c) find a symbolic expression for the ratio of the proton stopping potential and the electron stopping potential, av, jav, the answer should be in terms of the proton mass m, and electron mass me

Would like to . could you translate to english

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.

Hellothe asnwer is b.have a nice day