Question

A slingshot is a child's toy that converts the strain energy of the stretched material into the moving energy of the propelled object. A boy pulls on his slingshot with a force of20 N and it extends by 7 cm. At what velocity does the 20 g stone fly off?

Answer 1

$A=E,$

$Fs=\frac{mv^2}2,$

$v=\sqrt{\frac{2Fs}m},$

$v=11.8~\frac ms.$