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NEET Physics QUESTION #7311
Question 1

A particle moves along a straight line with constant acceleration, changing speed from $10\text{ m/s}$ to $20\text{ m/s}$ while covering $135\text{ m}$. The time taken is:

  • 12 s
  • 9 s✔️
  • 10 s
  • 1.8 s
Correct Answer Explanation

Using $v^2 - u^2 = 2as$: $(20)^2 - (10)^2 = 2a(135) \Rightarrow 300 = 270a \Rightarrow a = \dfrac{10}{9}\text{ m/s}^2$

Using $v = u + at$: $20 = 10 + \dfrac{10}{9}t \Rightarrow t = \mathbf{9\text{ s}}$