Answer:
Explanation:
The sum of the kinetic and electric potential energies of the proton when initially released must be equal to their sum at infinity, so we have:
Which, since 
because initially the proton is at rest, is:
where 
is Coulomb's constant, 
the charge of the proton, 
the charge of the gold nucleus, since it has 79 protons, 
the initial separation between them, 
the mass of the proton and v its final velocity. 
is very far away, so the final electric potential will be 0J, and we have:
Answer:
All are not true.
Explanation:
Sound needs medium to travel.
sound speed is fastest in solids.
400 divided by 8 is 50, so its acceleration is 50 knots per second, meaning its speed is increasing by 50 every second.
Answer:
See below
Explanation:
Measure the distance and the amount of time to cover that distance
then speed = distance / time
