The resistivity of a material is 2x10-3Ωm. What is the conductivity\n

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

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Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg