Block of mass m_0 is at rest at the top of a ramp, and the block's center of mass is at a height H_1 above the ground. Block X is then released from rest, and it slides down the ramp and collides with block Y of mass M_0, which is initially at rest and has its center of mass at a height h above the ground. At the moment before the collision, block X has a speed of V_0. After the collision, block Y traveles such that it lands at point P.

Consider the block X block Y system from the moment in time that block X is released from rest to the moment immediately after block X collides with block Y. Which of the following claims best describes the system?

The answer is A, because the total momentum of the system does not remain constant, the system is open. Can you explain why this is?

he kicked it 10 feet straight up into the air? i think this works.

ok

explanation:

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