10. what is commonly used to run a central heating system?
geothermal energy
solar energy
electrical energy
nuclear energy

Electrical energy is commonly used to run a central heating system.

Explanation:

Central heating is a method of heating a building, where heat is produced centrally and then distributed to different sites through a heat distribution system.  

A typical construction is water heating. In it, an electric water-heating boiler reserves a hot water heater. The circulating pump or gravity recirculates the warming water in the accumulator in a closed water pipeline, which circulates the water in the radiators and releases heat to the various spaces in the desired amount.

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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