You are the mission commander of a 2000kg probe that is approaching Mars at a speed of 25,000 km/hr. It needs to slow down to 15,000 km/hr to begin its descent to the surface. If the satellite enters the Martian atmosphere too fast, it will burn up; if it enters too slowly, it will use up its maneuvering fuel before reaching the surface and will crash. The satellite has a new braking system: several 5.0kg masses on the front that can be launched straight ahead at a speed of 139,000 m/s relative to the satellite. You need to send the rocket an instruction to tell how many bullets to fire. Success will bring you fame and glory, but failure of this $500,000,000 mission will ruin your career. How many bullets?

ill do it for 100, also this isnt 80 its 40

overcharge is the right answer system

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