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A car of mass m moves in horizontal circ...

A car of mass m moves in horizontal circular path of radius r meter . At an instant its speed is v m/s and in increasing at a rate of 'a' m/s^2. Then the acceleration of the car is,

A

`[ a^2 + v^2/r ]`

B

`sqrt (a^2 + [v^2/r])`

C

`a^2 + [v^2/ r]^2`

D

`sqrt (a^2 + [v^2/r]^2)`

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