Question
A shell of mass 200 g is ejected from a gun of mass 4 g by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is
-
100 ms-1
-
80 ms-1
-
40 ms-1
-
120 ms-1
Solution
A.
100 ms-1
In the given problem conservation of linear momentum and energy hold good.
Conservation of momentum yields.
m1v1 + m2v2 = 0
4v1 + 0.2 v2 = 0
Conservation of energy yields
