Problems on Kinematics

S4 The graph shows the position of an object versus time.
a.) At what time(s) is the object at the origin?
b.) At what time(s) is the object at rest?
c.) At what time(s) does the object have a negative velocity?
d.) What is the average velocity of the object in the time interval 0<t<2 seconds?
e.) What is the average velocity of the object in the time interval 0<t<6 seconds?
S5 An object is forced to move along a straight line. The table below shows measurements of the position of the object (relative to a fixed origin) versus time.
Position (m)Time (s)
2 0
2 1
1 2
-1 3
-1 4
0 5
1 6
a.) Make a graph of position versus time and draw a smooth curve through the points.
b.) In what time interval(s) is the object at rest?
c.) Estimate all times when the object is at the origin.
d.) What is the average velocity of the object in the time interval 2<t<4 seconds?