What two things describe an assertive person?​

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.

Most short-period comets do not have randomly oriented orbits because

What are the dimensions of the cross section that passes through the points a, f, g, and d?