The rider has a mass of 100 kg. when travelling downward from point e to d, he reaches a velocity of 11 m/s. calculate his kinetic energy at d (show your work). (ke= ½ mv2)

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.