You're having a hard time pushing a refrigerator across the kitchen floor. The force of your own push is 830 N. The refrigerator has a mass of 344 kg.
The refrigerator moves with a constant velocity of 0.84 m/s for 4.7 s. What is the magnitude of the frictional force opposing your push?
What force must you push with if you want to increase its velocity by 0.84 m/s over these 4.7 s?