(constant) force is the stone subjected during the acceleration? 18. A block of ice slides down a 45° inclined plane in twice the time it takes to slide down
a 45° frictionless inclined plane. What is the coefficient of kinetic friction between the
ice block and the incline?
19. A 0.20 kg mass attached to the end of a spring is whirled in a vertical circle by a
student. At some positions, the mass experiences a downward force of -62) N and a
horizontal force 38i N. Determine its acceleration in this position,
20. Forces F1 (east) and F2 are simultaneously applied to a 3.0 kg, mass. When Fz is east,
a = 5.0 m/s2 east and when Fz is west a = 1.0 m/s2 east. Determine the magnitude
of Fi and F2.​