What is the force on a box that is being pushed to the right with 50n of force while, at the same time, being pushed to the left with a 20n force?

Aballet student who learns with the of his instructor is demonstrating learning.

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.