The radius of Mars (from the center to just above the atmosphere) is 3400 km (3400 × 103 m), and its mass is 6 × 1023 kg. An object is launched straight up from just above the atmosphere of Mars.

a) What initial speed is needed so that when the object is far from Mars its final speed is 3000 m/s? vinitial = m/s

b) What initial speed is needed so that when the object is far from Mars its final speed is 0 m/s? (This is called the "escape speed.") vescape = m/s

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Aball horizontally thrown from a cliff at 8m/s