What is the acceleration of the object?

[laurenbaboran]

Homework Statement

Consider a 3 kg object moving in a 2.5 m radius circle at 5.7 m/s to answer the next 2 questions.

4. How much force is required to keep the object moving in the circle?
1.3 N
3.3 N
39 N
6.8 N


5. What is the acceleration of the object?
13 m/s2
39 m/s2
6.8 m/s2
2.3 m/s2

Homework Equations

For the first one:
F=m*a
a=(v^2)/r = (5.7^2)/2.5 = 12.9996

thus, F=3*12.9996 = 38.988N

The Attempt at a Solution

I think I got the first one. Is that one the right answer? I can't figure out the second one though. Thanks for your help!

 

[voko]

You cannot figure out acceleration? What is 'a' then?

 

[Enigman]

Actually I think you have already got it. Just round your answer off.
(And some vector signs won't hurt...)

 

[laurenbaboran]

Oh my gosh you're right. I did too much work lol. Thanks!