Question

A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is

(a) 40 ms⁻¹

(b) 120 ms⁻¹

(c) 100 ms⁻¹

(d) 10 ms⁻¹

Answer 1

Answer is : (c) 100 ms⁻¹

Total energy = E₁ + E₂ = 1050 J

where, m₁ = mass of shell and m₂ = mass of gun.