Question

A stone falls from a balloon that is descending at a uniform rate of$12m/s$. The displacement of the stone from the point of release after 10 sec is

• A. 490 $m$
• B. 510 $m$
• C. 610 $m$
• D. 725 $m$

Answer 1

Answer: (C)

610 $m$

Answer 2

$u = 12\mspace{6mu} m/s$, $g = 9.8\mspace{6mu} m/\sec^{2}{}$, $t = 10\mspace{6mu}\sec$

Displacement $= ut + \frac{1}{2}gt^{2}$

$= 12 \times 10 + \frac{1}{2} \times 9.8 \times 100 = 610m$