Answer:
It will do nothing. The forces are balanced and the ball's motion will not change
Answer:
The width of the central bright fringe on the screen is observed to be unchanged is 
Explanation:
To solve the problem it is necessary to apply the concepts related to interference from two sources. Destructive interference produces the dark fringes. Dark fringes in the diffraction pattern of a single slit are found at angles θ for which

Where,
w = width
wavelength
m is an integer, m = 1, 2, 3...
We here know that as
as w are constant, then

We need to find
, then

Replacing with our values:


Therefore the width of the central bright fringe on the screen is observed to be unchanged is 
Answer:
Explanation:
We can use the Einsten's relation which states the equivalence between mass and energy:
where
E is the energy
m is the rest mass of the object
c is the speed of light
By using this formula and m=2.5 kg, we can find the equivalent energy of the object: