9. Mushka thought it would be funny to run over Gani with a shopping cart, she comes at her with a force of 220 N. Gani pushes back with all of her might, at only a force of 130
N. Natasha saw this and came to Gani's aid, she helped her push back with an additional
force of 120 N. It ended up being, that the cart was pushed at an acceleration of 2 m/s?.
What is the mass of the cart?

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

a skateboard rolling across the street - apex