An object of mass 2 kg is moving at a velocity of 4 m/s. What is the momentum of the object?

If a force of 100 N is applied to an object for 6 seconds, and the change in momentum is 300 kg m/s, what is the mass of the object?

During a collision, a 0.2 kg object moving at 6 m/s collides with another object initially at rest. If the collision is perfectly elastic and the second object has a mass of 0.3 kg, what are their velocities after the collision?

Two objects of masses 4 kg and 6 kg move with velocities of 3 m/s and 2 m/s, respectively, towards each other. What is the total momentum of the system before the collision?