The moon moves around the earth in a circular orbit. Are the following from zero at half the orbit: a) momentum increment;

The moon moves around the earth in a circular orbit. Are the following from zero at half the orbit: a) momentum increment; b) the work of the force of gravity?

The impulse increment at half the orbit is equal to 2mv, where v is the orbital velocity of the Moon; m is its mass. The work of the force of gravity is zero.

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