Answer:
B. 10N
Explanation:
In order to find the frictional force acting on the object, we can use the formula Force=mass x acceleration to find the difference in force between the event occurring in an environment with no friction and an environment with friction. Our given values are:
Force = 30N
Mass = 2kg
Acceleration = 10m/s/s
So for the formula we will first find the required amount of energy in a frictionless setting:
F = 2 x 10
F =20
This means that with the condition that there is no friction, a force of only 20N is required, but in real circumstances, a force of 30N was required. This means that the frictional force acting upon the object was 10N.
Hope this helped!