Answers

2015-07-17T19:49:01+05:30
Speed of any particle can not be negative because because speed does not have any direction it is just the total path length traveled by an object in some particular time  and also speed is a scalar quantity
it just have the magnitude
for example if the body is moving with the particular speed of 20m/s
then it is just moving and the movement of any object with respect to time is positive always

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2015-07-17T22:20:12+05:30
 the speed of the particle  cannot be negative because it doesnot have any path.............
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