In general it is best to conceptualize vectors as arrows in space, and then to make calculations with them using their components. (You must first specify a coordinate system in order to find the components of each arrow.) This problem gives you some practice with the components. Let vectors A→ =(1,0,−3), B→ =(−2,5,1), and C→ =(3,1,1). Calculate the following, and express your answers as ordered triplets of values separated by commas.
A) A - B =
B) B - C =
C) -A + B - C =
D) 3A - 2C =
E) -2A + 3B - C =
F) 2A - 3(B-C) =

answer: good job it's all correct !

explanation:

neither accurate nor precise.

wavelength divides in half and speed stays the same.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s