An object is released from rest at time t = 0 and falls through the air, which exerts a resistive force such that the acceleration a of the object is given by a = g - bv, where v is the object's speed and b is a constant. if limiting cases for large and small values of t are considered, which of the following is a possible expression for the speed of the object as an explicit function of time? v = g(l - e-bt)/b v = (gebt)/b v = gt - bt2 v = (g + a)t/b v = v0 + gt, v0 0 an ideal massless spring is fixed to the wall at one end, as shown above. a block of mass m attached to the other end of the spring oscillates with amplitude a on a frictionless, horizontal surface. the maximum speed of the block is vm. the force constant of the spring is mg/a mgvm/2a /2a /a2 /2a2

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.