The coordinates of a moving particle at any time $t$ are given by $x = a\, t^2$ and $y = b\, t^2$. The speed of the particle is
- [AIIMS 2012]
- A$2t\, (a + b)$
- B$2t\,\sqrt {\left( {{a^2} + {b^2}} \right)} $
- C$2t\,\sqrt {\left( {{a^2} - {b^2}} \right)} $
- D$\sqrt {\left( {{a^2} + {b^2}} \right)} $
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- [JEE MAIN 2021]
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- [AIPMT 2015]
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