WAEC Physics 2017 Objective — Question 7
Question 7 of 50 from the West African Examinations Council (WAEC) Physics 2017 Objective paper, with the correct answer and a full explanation.
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Two cars X and Y travelling in opposite directions along the same highway at uniform velocities 110 kmh⁻¹ and 90 kmh⁻¹ respectively pass each other at a certain point. The velocity of X relative to Y at the time they pass each other is
- A. A. 200 kmh⁻¹Correct
- B. B. 100kmh⁻¹
- C. C. 40kmh⁻¹
- D. D. 20kmh⁻¹
Explanation
Since they are moving in opposite directions, the relative velocity is a vector quantity given by the sum of both velocities = (110+90)km/hr = 200km/hr.
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