[单选题]
A spring-driven dart gun propelsmwm1 o 3.-3wy+i x)gtwhcl5w u a 10-g darogx (c5v27 *aflwco7w t. It is cocked by exerting a force of 20 N over a distance of 5.0 cm. With what speed will the dart leave the gun, assuming * 77av(c2wxfow ocl5g the spring has negligible mass?
