Asmall ball is attached to one end of a spring that has an unstrained length of 0.169 m. the spring is held by the other end, and the ball is whirled around in a horizontal circle at a speed of 3.15 m/s. the spring remains nearly parallel to the ground during the motion and is observed to stretch by 0.0131 m. by how much would the spring stretch if it were attached to the ceiling and the ball allowed to hang straight down, motionless?

i don't know that i agree with that but what's the question ?

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