Atmosphere has about 21% Oxygen , 78% Nitrogen and Some CO₂ and some other rare gases and water vapour.
So it is composed mostly of Nitrogen gas.
Answer:
Potassium
k = Potassium
Potassium Has 19 Electrons
the atomic mass is 39.0983
Answer:
0.1 N
Explanation:
Considering the relationship between force,
spring constant and extension as defined by Hook's law
The force F=xk as from Hooke's law where F is the force of the spring, k is spring constant and x is extension or compression. Substituting 2 N/m for k and 5cm which is equivalent to 0.05 m for extention x then the force will be
F=2*0.05=0.1 N
G = -10 m/s
s = 0.8 m
v = 0
u = ?
2as = v² - u²
-16 = - u²
u² = 16
u = 4 m/s