Asnail at position 3 cm moves to position 20 cm in 8 seconds.
what is it's displacement? use ad = df - di

17cm.

Explanation:

The equation you're using is:

Δd = df - di

Which means the change in position is equal to the final position minus the starting position. In this case that works out to 20cm - 3cm = 17cm. We're only interested in how much the snail moved, not how long it took to move, so even though they give a time it actually doesn't matter for this question.

the amount of current in the coil

moisture is lackin, and organic acids are scarce.