Alex collides with a desk as he runs through his office. if the combined
momentum of alex and the desk was 400 kg•m/s to the north before the
collision, what is their combined momentum after the collision?

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.