Answer: The flea is in the air for 0.657 seconds. Explanation: Use the equation: V² = U² + 2*a*s 0 = U² +2*(-9.8)*0.53 0= U² - 10.338 U² = 10.338 U = 3.22m/s Initial velocity = 3.22 m/s For part B: s = ut + ½*a*t³ 0 = 3.22t + (-4.9)t² 0 = 3.22t -4.9t² 4.9t² -3.22t = 0 t( 4.9t-3.22) = 0 t = 0 or t= 0.657 seconds.