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Motion in a Straight Line — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMotion in a Straight Line1 Mark
MCQ
Average speed of a car between points A and B is 20m/s, between B and C is 15m/s, between C and D is 10m/s. What is the average speed between A and D, if the time taken in the mentioned sections is 20s, 10s and 5s respectively?
  • A
    17.14 m/s
  • B
    15 m/s
  • C
    10 m/s
  • D
    45 m/s
✓

Answer

  1. 17.14 m/s

Explanation:

Average speed is the total distance divided by total time taken.

Total displacement (d = vt) = 20 × 20 + 15 × 10 + 10 × 5 = 600m.

Total time = 20 + 10 + 5 = 35s.

Therefore, average speed $=\frac{600}{35}=17.14\text{m}/\ \text{s}.$

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