Which of these is true about 'Crack-the-whip' effect?

It moves the last trailer the most.. Section 7.1: Rearward amplification (crack-the-whip) causes the last trailer to swing much more than

Which of these is true about 'Crack-the-whip' effect?

ANSWER BREAKDOWN
  • A. Incorrect. "It moves the tractor the most." is not correct. Rearward amplification (crack-the-whip) causes the last trailer to swing much more than the tractor.
  • B. Correct. Rearward amplification (crack-the-whip) causes the last trailer to swing much more than the tractor.
  • C. Incorrect. "It only happens on ice." is not correct. Rearward amplification (crack-the-whip) causes the last trailer to swing much more than the tractor.
  • D. Incorrect. "It is safe." is not correct. Rearward amplification (crack-the-whip) causes the last trailer to swing much more than the tractor.