Final answer:
The normal force acting upon the boulder is 411.6 N.
Step-by-step explanation:
The normal force acting upon the boulder can be calculated using the equation:
N = mg
Where N is the normal force, m is the mass of the boulder, and g is the acceleration due to gravity.
In this case, the mass of the boulder is given as 42 kg. The acceleration due to gravity is approximately 9.8 m/s².
Therefore, the normal force acting upon the boulder is:
N = (42 kg)(9.8 m/s²) = 411.6 N