At time \( t = 0 \) a particle starts travelling from a height \( 7\hat{z}\,\text{cm} \) in a plane keeping \( z \) coordinate constant. At any instant of time it’s position along the \( \hat{x} \) and \( \hat{y} \) directions are defined as \( 3t \) and \( 5t^{3} \) respectively. At \( t = 1\,\text{s} \) acceleration of the particle will be:
