Sound of the thunder is heard only shortly after the lightning occur. Give reason
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Sound of the thunder is heard only shortly after the lightning occur.Sound of the thunder is heard only shortly after the lightning occur.Give reasonThis electric current is known as the return stroke. We see it as the bright flash of a lightning bolt. Thunder and lightning occur at roughly the same time although you see the flash of lightning before you hear the thunder. This is because light travels much faster than sound

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You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.