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Answer 1

➛Given That : initial velocity u = 10 m/s.

➛Final velocity v = 20 m/s.

➛Distance travelled = s = 135 m.

➛From the equation of motion,v = u + at.

$Acceleration (a )= \frac{v - u}{t} = \frac{20 - 10}{t} = \frac{ 10}{t} \: {m/s}^{2}$

➛$Distance \: travelled = s = ut + \frac{1}{2} \times {at}^{2}$

➛$135 = ut + \frac{1}{2} \times {at}^{2}$

➛$135 = 10t + \frac{1}{2} \times ( \frac{10}{t} \times {t}^{2} )$

⇛ $t = 9s$