Four children pull on the same toy at the same time yet there is no net force on the toy how is that possible

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Asmall 21 kilogram canoe is floating downriver at a speed of 1 m/s. what is the canoe's kinetic energy?