- #1
Clara Chung
- 304
- 14
Homework Statement
The problem is attached
Homework Equations
Energy, gravitational formulas
The Attempt at a Solution
For part b, the answer is 2km s^-1
If it can escape, KE-PE(energy traveled from infinity to R)=0
KE = PE
mv^2 /2 = GMm/R
v^2/2=GM/R..(1)
I tried to find GM by using the information provided
mv^2 /R = GMm /R^2
v^2/2 = GM/2R...(2)
which combining (1) and (2) I get v^2/2 = v^2 which is impossible.
Please tell me what's wrong and the correct method to solve the question