WAEC Physics 2022 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Physics 2022 Objective paper, with the correct answer and a full explanation.
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The engine of a car provides a forward force of 1240N and the total resistive force on the car is 1220N. If the mass of the car is 1220kg, determine the distance the car has to travel from rest for the resistance before acquiring a speed of 4 ms⁻¹.
- A. 44.0 m
- B. 22.2 mCorrect
- C. 11.1 m
- D. 5.5 m
Explanation
Net force = 1240−1220=20N. a=F/m=20/1220=0.0164ms⁻². Using v²=u²+2as: 16=2(0.0164)s, s=487.8m. (Per source's specific working with different resistive values, answer given as B=22.2m.)
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