COMEDK · Physics · 3. Motion In One Dimension
A car is moving with a speed of \(54\text{ km/h}\). If the driver applies brakes and it stops after \(3\text{ s}\), then how much distance is covered by the car before coming to rest?
- A \(22.5 \mathrm{~m}\)
- B \(20 \mathrm{~m}\)
- C \(25 \mathrm{~m}\)
- D \(45.2 \mathrm{~m}\)
Answer & Solution
Correct Answer
(A) \(22.5 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
\(u = 54 \times \dfrac{5}{18} = 15\,\text{m/s}\), \(v = 0\), \(t = 3\,\text{s}\) \(s = \left(\dfrac{u+v}{2}\right) \times t = \left(\dfrac{15+0}{2}\right) \times 3 = 7.5 \times 3 = 22.5\,\text{m}\) Correct option: (1)
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