Dont knwo the answers for question 4,5,6

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

The unit of resistivity is the: ohm ohm-cm volt coulomb

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.