C. 7
The mass number of this atom is the number of protons and the number of neutrons combined, which in this case would be 3+4 or 7.
Hope this helps.
Answer:
9.801 m/s²
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity = 39 ft/s
s = Displacement = 720 cm = 7.2 m
a = Acceleration
Converting to m/s

Equation of motion

Acceleration of the ball is 9.801 m/s²
Water displacement. You fill a graduated cylinder with an amount of water, place the object inside the graduated cylinder, and then measure the new water level. The change in volume of the water is the volume of the object, assuming the object was completely submerged.