1. The problem statement, all variables and given/known data A jet aircraft climbs in a straight line at an attitudeof 90 degrees to the hozizontal. The jet thrust amounts to 90kN, the mass of the aircraftis 8 tonne and the average air resistance mounts to 11kN. Calculate the time taken to reach a height of 3 km if the speed at the start of the climb is 160Km/h. 2. Relevant equations u= 160km/hr = 44.4 m/s a= to be calculated s= 3000m t= S=u*t+ 1/2 at^2 F= m times a 3. The attempt at a solution vertical acceleration force 79 cos 60 - 8000kg F=ma a=f / m 0 = (1/2a) t^2 + (u) t + s 0 = 2.435t^2 + 138.56 t - 3000 am confused.