61. What is the average acceleration of the bus for the entire 3.5-h period shown in the graph?

Question

the graph is on page 22, question 61 in the right column

http://media.wiley.com/product_data/excerpt/88/04717139/0471713988.pdf

and please show the process as well

Answer 1

The average acceleration is defined to be the final velocity minus the initial velocity divided by the elapsed time

Elapsed time = 3.5 hours

All numbers read from the graph are the best I can estimate, they really should have included a table.

Initial velocity = slope of line A

Initial velocity = 25 km / 1hour = 25 km/h

Final velocity = slope of line C = (27 - 34)/1 = -7 km/h

Average acceleration = (-7 - 25)/3.5 = -32/3.5 = -9.14 km.h^2

Answer 2

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