Answer:
The measured value of the constant is known with some certainty to four significant digits. In SI units, its value is approximately 6.674×10−11 m3⋅kg−1⋅s−2. The modern notation of Newton's law involving G was introduced in the 1890s by C. V. Boys.
add text fully or atleast add book name edition . solution is in picture. chk pictures ignore b part
Explanation:
It is directed inward, toward the center of a circle.