A stone whirled on a string experiences a centripetal acceleration of 10 m/s². If the string were shortened to half its length (one-half the radius) and the speed were doubled, calculate the centripetal acceleration. How can I find this without knowing either speed or the radius?

Question

anonymous · Answer

@douglaswinslowcooper  
Do you understand this one?

anonymous · Answer

a = v^2/r = 10 m/s^2

a' = (2v)^2/(0.5r)

a'/a = 8 
a' = 80 m/s^2

anonymous · Answer

Okay thank you very much