You put your spacecraft in a circular orbit around planet Z, which has half the radius of earth and has one-quarter the mass of earth. compared to being in an orbit of the same size around earth, when it orbits around planet Z your spacecraft will have:

A - The same acceleration and the same orbital period

B - Half the acceleration and half the orbital period

C - One-quarter the acceleration and one-quarter the orbital period

D - One quarter the acceleration and the same orbital period

E - None of the above

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?