Question
Question: A shell of mass 20 kg at rest explodes into two fragments whose masses are in the ratio 2 : 3. The s...
A shell of mass 20 kg at rest explodes into two fragments whose masses are in the ratio 2 : 3. The smaller fragment moves with a velocity of 6 ms–1. The kinetic of the larger fragment is :
A
96 J
B
216 J
C
144 J
D
360 J
Answer
96 J
Explanation
Solution
\ m1v1 = m2v2 (m1 = 3kg & m2 = 12kg)
\ 8 × 6 = 12 × v2 Ž v2 = 4m/s
\ K2 = 21(12)(4)2 = 96 J