NERS WANEFMAC7 12.5.012. MY NOTES PRACTICE AN A rather flimsy spherical balloon is designed to pop at the instant its radius has reached 3 centimeters. Assuming the balloon is filled with helium at a rate of 14 cubic centimeters per second, calculate how fast the radius is growing at the instant it pops. (The volume of a sphere of radius r is V = . Round your answer to decimal places.) x cm/s