The position of a particle moving along a coordinate line is s equals startroot 92 plus 4 t endroot, with s in meters and t in seconds. find the particle's velocity and acceleration at t equals 2 sec. the velocity at t equals 2 sec is nothing m divided by sec.

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layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

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.