A 50 kg car collided with a tree on the road at a speed of 50 m/s and fell into a ditch 3 seconds after reversing at a speed of 10 m/s. If the depth of the hole is 10 times the ratio of the last minute velocity to the initial speed of the vehicle , then if a 0.1 kg ball is thrown down from this height at a speed of 10 m/s, a 0.5 kg mass rat for the momentary velocity before touching the ground .What speed will be gain tha rat?

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

answer///scientific method;