Question

10- 8 6 i(s) -2 -6 Figure P2.3 Find the average velocity in the following time intervals. (a) 0 to 5 s .9 Your response is within 10% of the correct value. have a mistake in your ca cuiation. Carry out all nter mediate results to at least four-digit accuracy to minimize roundoff error. m/s (b) 0 to 6 s 0 (c) 2 s to 4s -2.75 Your response differs from the correct answer by more than 10%. Double check your calculations. ms (d) 4 s to 7 s This may be due to roundoff error, or you could m/s

Answer 1

(a) Displacement of the object from t = 0 to t = 5 s

d = 5.0 m (look closely the graph)

Time, t = 5.0 s

So, average velocity, v = d/t = 5.0/5 = 1.0 m/s

(b) t = 0 to t = 6 s

Displacement of the object during this time, d = 0

time, t = 6 s

So, average velocity, v = d/t = 0/6 = 0

(c) t = 2 s to t = 4 s

Displacement, d = 10.0 m – 5.0 m = 5.0 m

Time, t = 4-2 = 2.0 s

So, average velocity, v = d/t = 5.0 / 2 = 2.5 m/s

(d) t= 4 s to t = 7 s

Displacement, d = 5 – (-5) = 10.0 m

Time, t = 7 – 4 = 3 s

So, average velocity, v = d/t = 10/3 = 3.33 m/s