8. The projectile mass m = 10 kg released from the anti-aircraft gun with vertically υ0 speed = 800 m / s. Considering the effect of air resistance is proportional to the speed, to determine the time t rise to the highest point of the projectile. The drag coefficient k = 0.25 kg / s.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)