An object has a displacement of +18.5 m/s ending up at a final position of +7.8 m. The initial position (x) of this object must have been
26.3
m. FOLLOW PROPER RULES OF SIGNIFICANT
DIGITS.

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.