A 0.5 kg block, block-A, sliding frictionless in the x-direction at an initial speed of 1.5 m/s, collides with a stationary block, block-B, of mass m . The collision is elastic. After the collision, block-A continues traveling in its original direction at 0.7 m/s. (a) What is the mass of the second block? (b) What is its speed after the collision ? (c) What is the speed of the center of mass of the two blocks? Note: The velocity of the CM for a system of particles is calculated similarly to the position of the CM. (d) If the block-A is in contact with block-B for 0.2 ms, what is the average force applied on block-B? (e) What is the impulse?​

where are the vectors ?

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

the answer is a. hope this .

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