PHYSICS QUESTION! Initial Speed Mercury.?

Posted on 2015-10-22 07:30:00 in Physics by MANDY

The radius of Mercury (from the center of the planet to just above the atmosphere) is 2440 km (2440?103 m), and its mass is 0.3?1024 kg. An object is launched straight upwards from just above the atmosphere of Mercury.

(a) What initial speed is needed so that when the object is distanced from Mercury its final speed is 1000 m/s?

(b) What initial speed is needed so that when the object is distanced from Mercury its final speed is 0 m/s? (Escape Speed)

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