Mars is about twice as far from the sun as is Venus (rVenus = r, rMars = 2r). A Martian year, which is the time it takes Mars to go around the sun, is
about three times as long as a Venusian year (Tvenus = T, TMars = 3T).
a. Which of the two planets has the greater rotational speed in its orbit?
b. Which planet has the greater tangential speed?

The answer is a.  i hope this

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.

The answer is mean don't know