Your 'cq_1_01.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
a)
(20-10 cm)/(9-4 sec)= 10/5= 2 cm/sec
b)
(40cm-10cm)/3 sec=30/3 = 10cm/sec over a 3 second interval
c)x/10=5 cm/sec
then the position changes by 50 cm.
** **
10 min
** **
Good. Note in future submissions that you need to insert your responses into a copy of the question, according to the instructions. No problem here. On some subsequent questions you might want to refer back to the posting, and without the questions you might not remember what you're looking at.