Does anyone understand the question where it says EXPLAIN ?

Most short-period comets do not have randomly oriented orbits because

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.