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You said Please explain about this

Could you explain it with more details?

so, it is (b). About Phobos

sorry. I edited. and did I use wrong english by first cosmic speed? I thought it was minimum speed at which an object orbits a planet...

please see previous conversation

g is not constant.

Isn't it linear velocity of Phobos and semimajor axis of Phobos? then the velocity is the diffrence?

I think (b) means time for an object with the mass of Phobos to collide with Mars.

What is diffrent bitween a and b...?

Yes. I am certain. But just to be clear. what exactly does (a) mean?

sorry PeroK but if you have time, can you email me about details?

you are right. But just for once follow my equation and calculate. It will be Earth's gravitational constant

I'm sorry. I tried to talk to jbriggs444

and if you want it explained theoretically, please derive the law of universal gravitation with Kepler's third law

Oh, sorry. I think it's b