Mechanics | Relativity Answers

What is the mass of block X?
Block A of mass 8.0 kg and block X are attached to a rope that passes over a pulley. A 50-N force P is applied horizontally to block A, keeping it in contact with a rough vertical face. The coefficients of static and kinetic friction between the wall and block A are μs = 0.40 and μk = 0.30. The pulley is light and frictionless. In the figure, the mass of block X is adjusted until block A descends at constant velocity of 4.75 cm/s when it is set into motion. What is the mass of block X?

A - 6.5 kg
B - 7.2 kg
C - 9.5 kg
D - 8.8 kg
E - 8.0 kg

THIS IS THE IMAGE: http://i102.photobucket.com/albums/m90/CMParts/f1q111g1_zpsf92b2525.jpg

I have been tryinng to figure this out: An object moves with constant acceleration 3.65 m/s2 and over a time interval reaches a final velocity of 11.4 m/s.
(a) If its initial velocity is 5.7 m/s, what is its displacement during the time interval?

(b) What is the distance it travels during this interval?

(c) If its initial velocity is -5.7 m/s, what is its displacement during the time interval?

(d) What is the total distance it travels during the interval in part (c)?

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Determine the frequency, and the angular frequency of the motion. Write expressions for
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