8) Which of the following are the units for the spring constant? a) Kg m2/ s2 b) kg s2 c) kg m / s d) kg / s2 9) An engine maintains constant power on a conveyor belt machine. If the belt's Velocity is doubled, the magnitude of its average acceleration a) Doubled b) quartered c) halved d) quadrupled e) same 10) A mass m is moving horizontally along a nearly frictionless floor with a velocity v. The mass encounters a part of the floor that has a coefficient of kinetic friction given by u. The total distance traveled by the mass before it is slowed by friction to a stop is; a) 2v2 / ug b) v2 / 2ug c) 2ugv d) uvg e) uv2 / 2g 11) Two unequal masses are dropped simultaneously from the same height. The two masses will experience the same change in; a) acceleration b) Kinetic energy c) Potential energy d) velocity