Q21. A particle moves in a straight line so that its displacement $x$ at any time $t$ is given by $x ^ { 2 } = 1 + t ^ { 2 }$. Its acceleration at any time t is $x ^ { - \mathrm { n } }$ where $\mathrm { n } =$ $\_\_\_\_$
Q21. A particle moves in a straight line so that its displacement $x$ at any time $t$ is given by $x ^ { 2 } = 1 + t ^ { 2 }$. Its acceleration at any time t is $x ^ { - \mathrm { n } }$ where $\mathrm { n } =$ $\_\_\_\_$\\