David pushes on a box with a force of 11 Newtons to the right, and his friend pushes on the box with a force of 8 Newtons to the left. What is the net force acting on the box?

19 net force

Explanation:

Net force is the sum of all forces acting on an object. The net force can be calculated using Newton's second law, which states that F = ma, where: F is the net force. m is the mass of the object

        F = 11N + 8N

             F = 19N          

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000