Answer:
13.23J
Explanation:
PE = m*g*h
PE = (3 kg ) * (9.8 m/s/s) * (0.45 m)
A proton repelling another proton
Like charges of the protons would repel one another.
No
Explanation:Brooo it does not contribute to the eco system
Answer:

Explanation:
Ohms law says that the current in the conductor between the two points is directly related or directly proportional to the voltage by keeping a proportionality of constant which is called resistance.
Mathematically Ohms law can be written as,

Here, I is the current measure in ampere or amperage, V is voltage measure in voltage and R is resistance measure in Ohm.
Now the relation between the amperage, voltage and resistance will be,

Amperage=Voltage/Resistance
R=u^2 sin2x / g
7.8=u^2 sin2*30 /10
u=9.5m/s