Word problem

Question

pointer of a meter can travel to the right at the rate of 10.0 cm/s. what must the minimum return rate if the total time for the pointer to traverse the full 12.0 cm scale and return to zero must not exceed 2.00 seconds

Answer 1

The pointer takes 1.2 sec to travel to the right.

The pointer must return in 0.8 sec.

12cm = r 0.8sec

15cm/sec = r