An Object is moving along the x-axis. The graph above shows it\'s velocity as a

Question

An Object is moving along the x-axis. The graph above shows it's velocity as a function of time along the x-axis. Various intervals of the graph are identified by the letters A,B,C,D,E,F,G.

a) Which interval is the object moving in the negative direction?

b) At what instants, if any, does the object reverse it's direction of motion?

c) What is the instantaneous acceleration of the object at t=4.0s? (please show calculations/reasoning)

d) What is the displacement of the object between t=0s and t=3s? (please show calculations/reasoning)

Explanation / Answer

a) from 4 to 7 sec

b) 4 sec

c) 0 m/sec^2

d) s= area of triangle + area of rcetangle

    s =0.5 x 2 x 2+ 1x2 =4m

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