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A truck starts from rest and accelerates...

A truck starts from rest and accelerates uniformly at `2.0 ms^(-2)` . At t = 10 s , a stone is dropped by a person standing on the top of the truck ( 6 m high from the ground). What are th (a) velcity , and (b) acceleration of the stone at t = 11 s ? (Neglect air resistance ).

A

22.4 m/s at an angle of `tan^(-1) 1/2` with the horizontal `10m//s^2` vertically downwards

B

22.4 m/s at an angle of `tan^(-1) 1/2` with the vertical, `10m//s^2` vertically downwards

C

`10m//s^2` at an angle of `tan^(-1) 1/2` with the horizontal, 22.4m/s vertically downwards

D

`10m//s^2` at an angle of `tan^(-1) 1/2` with the horizontal 22.4 m/s vertically downwards

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The correct Answer is:
A
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