Vector sum of horizonal forces is
F
pencil - F
friction = 2[N] - 1[N] = 1 [N]
The mass of the book is 2.5[N] /10 [N/kg] = 0.25 kg
The acceleration is a = F/m = 1[N]/0.25[kg] = 4 [N/kg]
After 1.5 seconds the bool will have V = at
2/2 = 4* 1.5
2 /2 = 4.5 [m/s].
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