B, D, E, F, H, I, K, L, M, N, P, R, T,
(As capitals)
b, d, h, i, k, l, m, n, p, q, r,
(as small letters)
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An upward sloping straight line indicates that the object being studied is moving away from the origin and that the component of its velocity in the radial direction is a constant. A downward sloping line indicates it is moving towards the origin. However, neither line says anything about the transverse component of its motion.
Only if it's drawn as a straight line. If the horizontal line at the base, and the sloping line at the top are added, it is not symmetrical.
It means that as time goes on, the distance increases quickly.
Ramp?
A straight line, through the origin, sloping up from left to right. The gradient of the graph will be the constant of proportionality.