In a circus, a performer throws an apple towards a hoop held at $45 \mathrm{m}$ height by another performer standing on a high platform (see figure below). The thrower aim s for the hoop and throws the apple with a speed of $24 \mathrm{m} {\mathrm{s}}^{-1}$. At the exact moment that the thrower released the apple, the other performer drops the hoop. The hoop falls straight down. At what height above the ground does the apple go through the hoop?

• A

  $21 \mathrm{m}$
• Correct answer
  B

  $22 \mathrm{m}$
• C

  $23 \mathrm{m}$
• D

  $24 \mathrm{m}$

Hence, the correct answer is option: 'B'.