$$\text { A particle moves with position function } \mathbf { r } ( t ) = \left( 21 t - 7 t ^ { 3 } - 5 \right) \mathbf { i } + 21 t ^ { 2 } \mathbf { j } \text {. }$$ $$\text { Find the tangential component of the acceleration vector. }$$

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The Answer of $$\text { A particle moves with position function } \mathbf { r } ( t ) = \left( 21 t - 7 t ^ { 3 } - 5 \right) \mathbf { i } + 21 t ^ { 2 } \mathbf { j } \text {. }$$ $$\text { Find the tangential component of the acceleration vector. }$$

Find the tangential component of the acceleration vector. \text { Find the tangential component of the acceleration vector. } Find the tangential component of the acceleration vector.

$\text { Find the tangential component of the acceleration vector. }$