We can find the momentum of the rock by using De Broglie's relationship:

where
p is the momentum
h is the Planck constant

is the De Broglie's wavelength
By using

, we find

The momentum of the rock is

where

is the mass and v is its velocity. Rearranging the equation, we find the speed of the rock:
D.) The energy needed to create work.
Answer:
t=7.33 s
Explanation:
According to Newton's second law:

because we don't want the box to slide, the acceleration has to be zero.

we know that:

Now having the acceleration, we can use the following formula.

Answer: it's an electronic device
Explanation: it's where you store and process data, it acts according to the instructions given to it in a variable program.
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