Question

define momentum.
a)write its SI unit.
b)how much momentum will an object of mass 10kg transfer to the floor, if it falls from a height of 5m. (g=10ms^2)

Answer 1

Dear student,
Momentum can be defined as the vector quantity which involves the product of the mass and the velocity of an object.
It is represented as p = mv

a) The SI unit is kilogram meter per second or kg m/s.

b) Firstly the velocity will be calculated using third equation of motion.
Initial velocity, u =0 because it is free fall condition
V= to be calculated
Height h = 5m
According third equation of motion
$$\begin{gathered} v^{2^{}}-u^2=2as \\ {v}^2-0=2x10x5 \\ {v}^2=100m/s \end{gathered}$$
v= 10m/s
Now, momentum p= m v
p=10x 10
p=100Kgm /s
Regards