WAEC Physics 2021 Paper

Concept:The distance covered by a body is equal to the total area under its velocity–time graph.Explanation:The given graph can be divided into a square and a trapezium.Area of the square is found using side $\times$ side.$\text{Area of square} = 4 \times 4 = 16$.Area of the trapezium is found using $\frac{1}{2}(a + b)h$.Here, $a = 4$, $b = 10$, and $h = 8$.$\text{Area of trapezium} = \frac{1}{2}(4 + 10) \times 8$.$= \frac{1}{2} \times 14 \times 8 = 56$.Total distance covered is the sum of both areas.$\text{Total distance} = 16 + 56 = 72\ \mathrm{m}$.Answer:The distance covered by the body is $72\ \mathrm{m}$, so the correct option is C.