The graph shows a car's velocity over time. Velocity versus Time
60
50
40
Velocity, in mph forward
30
20
10
1 2 3 4 5 6
Time, in seconds (s)
During which time period does the car have the greatest acceleration?
A. Between 1 and 2 seconds
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B. Between 0 and 1 seconds
C. Between 2 and 4 seconds
D. Between 1 and 6 seconds

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c