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The radius vector of a particle varies w...

The radius vector of a particle varies with time t as `vecr=vecbt(1-alphat)` is a constant vector and a is a positive factor.Find the distance s covered before the particle comes to rest

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`vecr=vecbt(1-alpha t)`
For initial point , `vecr=0,vecb=t(1-alphat)=0`
`t=0"and" t=1/alpha` Hence,` Deltat=1/alpha `
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