Write any two differences between simple cell and dry cell?

I can only assume that you meant "wet" cell and dry cell in the context of batteries.

A wet-cell battery is the primary type of rechargeable battery and is generally found in aviation, electric utilities, energy storage, and cellphone towers. The difference between a wet-cell battery and dry-cell battery would be that a dry-cell battery does not contain liquid - hence the name.

Explanation:

Wet cell batteries carry a liquid electrolyte such as sulfuric acid -  a hazardous, corrosive liquid. A dry-cell battery does not contain this, and more diminutive dry-cell batteries, such as alkaline or lithium-ion, are typically used in transferable electronics, such as toys, phones, and laptops.

I hope this helps!

current flows in a wire

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