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The formula giving the altitude y(m) in ...

The formula giving the altitude y(m) in terms of time t ( seconds ) of an object moving vertically is `y=y_(0)+v_(0)t-16t^(2)`, where `y_(0)` is initial altitude and `v_(0)` is initial velocity .
If `y_(0)=8 and v_(0)=48 m//s ` , what are the altitude , velocity and acceleration of the object when t=2s ?

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40m, 16m/s vertically downward , ` 32m//s^(2)` (retardation )
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