A particle moves along a straight line with equation of motion
s = f(t) where s is measured in meters and t in seconds. Find the velocity and the speed when t = 4.
f(t) = 15 + 40t + 1

f(t) = 15 + 160 + 1

Step-by-step explanation:

it said that t= 4 and because the t is after the 40 you would times 40 by 4 to get 160. Then you add them all up and there you go you got your velocity and speed.

is only a line? i think so

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.