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The horizontal distance x and the vertic...

The horizontal distance x and the vertical height y of a projectile at a time t are given by `x=at` and `y=bt^2 +ct` where a, b and c are constants The magnitude of the velocity of the projectile 1 second after it is fired is

A

`[ (a^2 +(2b + c)^2]^(1/2)`

B

`[ (2a^2 +(b + c)^2]^(1/2)`

C

`[ (2a^2 +(2b + c)^2]^(1/2)`

D

`[ (a^2 +(b + 2c)^2]^(1/2)`

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