The area under the speed time graph given the total distance covered by car. What is the average velocity to two places of decimals?
A.
17.72 meter/sec.
B.
21.67 meters/sec
C.
2.5 meter/sec.
D.
20.45 meters/sec.
E.
13.33 meter/sec.
Correct answer is D
Time(sec) areas of the three sides are \(\frac{1}{2}\) x 2 x 20 = 20 x 2 = 40
\(\frac{1}{2}\) x 4 x 20 = 40
40 + 40 = 80
vel. = \(\frac{80}{4}\)
20 + 0.45 = 20.45 meter/sec.