Question

1. A slingshot is used to launch a 5.00-gram rock. The effective spring constant of the slingshot is 200 N/m. By what distance must the slingshot be stretched in order to launch the rock at 20.0 m/s?
kx²/2 =mv²/2.
x=sqrt(mv² /k) =
=sqrt(0.005•20²/200) =0.1 m
Thank you.
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