Physics velocity and acceleration problem?

Shaman

New member
Earth's orbit around the SUn is nearly circular. THe period is 1 year = 365.25 days. In an elapsed time of 2.70 days,

what is earth's angular displacement? I have already completed the first question and got 4.64×10-2 rad and it was right. the next two i can't figure out

what is the change in earth's velocity (perpendicular to the average velocity)

What is the earth's average acceleration during 2.7 days? (perpendicular to the average velocity)
 
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