Suppose the initial position of an object is zero, the starting velocity is 3 m/s and the final velocity was 10 m/s. The object moves with constant acceleration. Which part of a velocity vs. time graph can be used to calculate the displacement of the object?
Answer
A
the area of the rectangle under the line
B
the area of the rectangle above the line
C
the area of the rectangle plus the area of the triangle under the line
D
the area of the rectangle plus the area of the triangle above the line
Explanation
Displacement is the area under a velocity-versus-time graph. With velocity increasing from 3 m/s to 10 m/s, this area consists of a rectangle with height 3 m/s plus a triangle representing the increase from 3 to 10 m/s. Therefore, use the rectangle plus the triangle under the line: choice C.
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