Neither of those questions makes sense, and I believe that you should not waste your time worrying about them.
#61 gives you a lot of information about a ball, and then asks a question about a glove.
#62 gives a mysterious equation, doesn't tell you what either of the variables represents, and then asks for a quantity without ever telling us how that quantity is related to the equation.
Personally, my response to both questions would be "Insufficient information given".
Part a is simply mass*gravity. Tension=ma
Part b Tension= 50kg(10m/s+5.0m/s) = 750N
Answer:
0.15 mV
Explanation:
In order to exhibit wave nature, the de Broglie wavelength of the electron must be of the same size of the diameter of the pinhole, therefore:
The de Broglie wavelength of an electron is
where
is the Planck constant
is the mass of the electron
v is the electron's speed
Therefore, the electron's speed must be
When accelerated through a potential difference 
, the kinetic energy gained by the electron is equal to the change in electric potential energy, therefore
where
is the magnitude of the charge of the electron
So, we can find the potential difference needed:
