23.2.8. Determine initial mass m in the missile at the time of turning off its engine speed is 1200 m / s, and weight - 800 kg. The relative velocity of the particles separating vr = 900 m / s. The initial velocity is zero. The forces of gravity and the resistance of the medium is not taken into account. (3.04)

Right after the payment you will receive a link to a zip archive with the solution of the problem 23.2.8
(DYNAMICS, Chapter 23 - Dynamics of a point of variable mass, paragraph - 23.2: Tsiolkovsky rocket equation) of Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
Task completed in word format (handwritten or typed solution in Word) or in manuscript form in gif / jpg format ..
After receipt of the decision would be very grateful if you leave a positive review.