A 16 kg bomb at rest explodes into pieces of masses 4 kg and 12 kg. The 12 kg piece moves at 4 m/s. Find kinetic energy of 4 kg piece (J).
Physics · Mixed Chapter
JEE Main Practice

Question

A 16 kg bomb at rest explodes into pieces of masses 4 kg and 12 kg. The 12 kg piece moves at 4 m/s. Find kinetic energy of 4 kg piece (J).

G1 Physics · Accepted Answer

Step 1: Momentum conservation: 4v₁ + 12(4) = 0, in one dimension. Step 2: v₁ = −12 m/s; magnitude is 12 m/s. Step 3: K₁ = ½×4×12² = 288 J.