In a spring gum having spring constant 100 `N//m` a small ball of mass 0.1 kg is put in its barrel by compressing the spring through 0.05 m
(a) Find the velocity of the ball when the spring is released.
(b) Where should a box be placed on the ground so that the ball falls in it, if the ball leaves the gun horizontally at a height of 2m above the ground. Take `g=10 m//s^(2)`

Answer

`[(a) 1.58m//s, (b) 1m]`