Answer:
Volume of the rock,

Step-by-step explanation:
It is given that,
Height of rock, h = 4 cm
Length of the rock, l = 5 cm
Breadth of the rock, b = 2 cm
We need to find the volume of the rock. The formula for finding the volume of rock is as follows :


So, the volume of the rock is
. Hence, this is the required solution.