Ram and Shyam are two students of ACME couse. One day after the test, they start discussing about the motion of the moon around the earth. The moon is known to take 27 days in competing a circular orbit.
In the figure, the moon moves counterclockwise (ABCD) around the earth. Ram asks Shyam : "What is the direction of the impulse of gravitational force due to earth on moon for one half of an orbit, starting at C and ending at A"?

Options

A. `+ x`
B. `+ y`
C. `- x`
D. `- y`

Answer

B

Explanation

`vec(J)=Deltavec(P)` impulse-momentum theorem