A levee is a kind of wall that can help keep floodwater out of cities. Justine researched and built a model levee. She wants to find the weak points in her levee. By fixing them, she can make an even better levee.
How can Justine use her model to make her levee design even better?
A. She can test the model to show that it works.
B. She can test the model until the levee fails.
C.
She can take it apart and put it back together for practice.
D.
She can take it apart so she can use the pieces again.

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

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19