If the velocity of a body

$V=\sqrt{5000+24 x}$

$\frac{\mathrm{dV}}{\mathrm{dx}}=\frac{1}{2 \sqrt{5000+24 x}} \times 24=\frac{12}{\sqrt{5000+24 x}}$

$\operatorname{now} a=V \frac{d V}{d x}$

$=\sqrt{5000+24 x} \times \frac{12}{\sqrt{5000+24 x}}$

$\mathrm{a}=12 \mathrm{~m} / \mathrm{s}^{2}$