The free-body diagram below represents person on a skateboard riding down a ramp that forms a 30.0° angle with the ground. The normal force is perpendicular to the ramp and gravity points toward the center of the
Earth, or down. Use g = 9.8
m
32
Fnorm
Fg
30°
Calculate the magnitude of the acceleration of the skateboard along the ramp.

answer: pseudoscience

nah.   i'm just sleepy.

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