Question

I WILL AWARD BRAINLIEST!! PLEASE HELP!!! The figure below shows the movement of a pedestrian from point B to point E. Using the graph, answer the following questions:
A) What is the speed of the pedestrian BC, CD, and DE?

B) After what time since the stop did he arrive at point E?

C) Write the formulas for function d(t) for sections BC, CD, and DE

Answer 1

Answer:

Step-by-step explanation:

A. for BC, 40-20=20

4-0=4

20/4=5km/h

for CD, speed=0 as it stops

for DE, it is // to BC so speed also 5km/h

B. stop @ C when t=4

arrive @ E when t=10

10-4 = 6h

C. BC is d=40-5t

CD is d=20

DE is d=20-5(t-6)=50-5t

Answer 2

Answer:

Step-by-step explanation:

A) What is the speed of the pedestrian BC, CD, and DE?

Speed from B to C = distance/time = (40 - 20) / 4 = 20/4

= 5 km/h

Speed from C to D = distance/time = 0 / 2

= 0 km/h

Speed from D to E = distance/time = (20 - 0) / (10 - 6) = 20/4

= 5 km/h

B) After what time since the stop did he arrive at point E?

Since the stop at D, he arrived at E after (10 - 6) = 4 h

C) Write the formulas for function d(t) for sections BC, CD, and DE

For BC, d = 40 when t = 0 and d = 20 when t = 4

So d(t) = 40 - 5t

For CD, d = 20 when t = 4 and t = 6

So d(t) = 20

For DE, d = 20 when t = 6 and d = 0 when t = 10

So d(t) = 5 * (10 - t) or d(t) = 50 - 5t