A175-lb pole vaulter carrying a uniform 16-ft, 10-lb pole approaches the jump with a velocity v and manages to barely clear the bar set at a height of 18 ft. as he clears the bar, his velocity and that of the pole are essentially zero. calculate the minimum possible value of v required for him to make the jump. both the horizontal pole and the center of gravity of the vaulter are 42 in. above the ground during the approach