Positive ions from a base and negative ions from an acid form a .

Salt

Explanation:

When an acid reacts with the base then it undergoes neutralization to form a salt and water.

Acids are those substances which dissociate in the water to give ions.

Bases are those substances which dissociate in the water to give ions.

The reaction of neutralization can be represented as,

where is the salt formed.

the closer the planet is to the sun, the larger the gravity

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