Two meteoroids are heading for earth. their speeds as they cross the moon's orbit are 2.0 km/s. the first meteoroid is heading straight for earth. what is its speed of impact? . the second misses the earth by 5000 km. what is its speed at its closest point? using similar agrument, e at moon's orbit = (1/2)mv2 - gmm/r = e atthe closest point = (1/2)mv22 -gmm/(r1+r)

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

What is on your multiple choice anwers

The answer is: 6.3mi got it right