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.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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