Which statement describes the relationship between bond strength and the melting and boiling points of a substance? A. As the force between the particles increases, the melting point increases and the boiling point decreases
B. As the force between the particles increases, the melting point decreases and the boiling point increases
C. As the force between the particles increases, the melting and boiling points decrease.
D. As the force between the particles increases, the melting and boiling points also increase.​

D

Explanation:

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