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A particle moves in xy plane such that v...

A particle moves in xy plane such that `v_(x)=50-16 t` and `y=100-4t^(2)` where `v_(x)` is in m/s and y is in m. It is also known that `x=0` when `t=0`. Determine (i) Acceleration of particle (ii) Velocity of particle when `y=0`.

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`vecv=-30hati-40hatj,veca=-16hati-8hatj`.
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