The momentum of an object is the product between the mass m of the object and its velocity:

The truck in our problem has momentum equal to
and a mass of

so, if we re-arrange the previous formula, we can use these data to find the velocity of the truck:
A. Physics
The study of how objects interact with each other
The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature.
Answer:
0.544 eV
Explanation:
To ionize the hydrogen atom 
So the required energy is
as
So 
We have to calculate the energy required to ionize hydrogen atom when it is in n=5
So the energy should be less than 