What is needed to discribe an objects motion a position b direction c speed d all three

All three are needed to describe an objects motion. The position, the direction and the speed all contribute to an objects motion. The answer is D.

all of these (d)

Explanation:

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atomic = no of protons.

mass number-atomic number = neutron number

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .