Question

尼

怎麼寫

If the energy needed to send an object (initially at rest on the earth's surface) to a
maximum height H is a half of that for sending it into an orbit at the same height, what
would be the value of H in terms of RE (the radius of the earth)?
Ignore the earth's rotation. (A) 1/4; (B) 1/3; (C) 1/2; (D) 2/3; (E) None.