1. When two horizontal forces are exerted on a cart, 600 N forward and 400 N backward, the cart undergoes acceleration. Show that the additional force needed to produce nonaccelerated motion is 200 N....

1. When two horizontal forces are exerted on a cart, 600 N forward and 400 N backward, the cart undergoes acceleration. Show that the additional force needed to produce nonaccelerated motion is 200 N.

2. You push with a 20-N horizontal force on a 2-kg mass resting on a horizontal surface. The horizontal friction force is 12 N. Show that the acceleration is 4 m/s².