The wheeled cart of Prob. 3 /19 is now replaced with a 50-kg sliding wooden crate. The coefficients of static and kinetic friction are given in the figure. Determine the acceleration of the crate if (a) T = 300 N and (b) T = 400 N. Neglect friction at the pulley.

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T 50 kg 15° Hs = 0.50 He = 0.40 20°