An astronaut on Mars (mass 6.42x 10^23 kg, radius 3.39x 10^6 m) launches a probe straight upward from the surtace at 3.00x 10^3 m/s. What is the maximum height above the surface that the probe reaches? Neglect air resistance and the gravitational pull of
or the two small moons of Mars.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.