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A particle is moving in a straight line ...

A particle is moving in a straight line such that `dv//dt=-lambdav`, where `v` is the velocity and `lambda` is a constant. At `t=0`, the particle is at the origin and moves with velocity `v_(0)`. Sketch the following graphs:
`(a) v-t (b) s-t (c ) v-s (d) log_(e)v v//s t`

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