Pg 147:

35) 0.70, 0.60

36) 0.436

38) 1.4 m/s²

39) 1.0 m/s²

Pg 148:

47) a. 2s; b. The box will not move because there is not enough force applied to overcome friction

48) a. 1.78m/s²; b. 0.37; c. 9.4N; d. 2.67m/s