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The displacement r of a particle varies ...

The displacement r of a particle varies with time as `x=4t^(2)-15t+25` Find the position, velocity and acceleration of the particle at t = 0

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Position, x=25
Velocity `=(dx)/(dt)=8t-15`
`t=0,v=0-15=-15m//s`
acceleration `a=(dv)/(dt)=8ms^(-2)`.
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