A 4.00 kg object is moving at 5.00 m/s NORTH. It strikes a 6.00 kg object that is moving WEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The velocity of the 4.00 kg object after the collision is

2.33 m/s

Explanation:

Given

4 kg mass is moving towards North at

and 6 kg mass is moving towards the west at

They collide inelastically i.e. stick together

Conserving momentum in the horizontal direction(west)

Conserving momentum in the vertical direction(North)

Net velocity is the vector sum of two velocities whose magnitude is given by

The velocity of 4 kg mass will be the same as the combined mass because both the mass are moving together.

dang that balls went far

there are no contact forces mentioned on the list of choices that you've provided.