Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति
JEE Main & Advanced
Physics
Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति
Question Bank
Perfectly Inelastic Collision
question_answer
A bullet of mass a and velocity b is fired into a large block of mass c. The final velocity of the system is [AFMC 1981, 94, 2000; NCERT 1971; MNR 1998]
A) \[\frac{c}{a+b}\cdot b\]
B) \[\frac{a}{a+c}\cdot b\]
C) \[\frac{a+b}{c}.a\]
D) \[\frac{a+c}{a}\cdot b\]
Correct Answer:
B
Solution :
Initially bullet moves with velocity b and after collision bullet get embedded in block and both move together with common velocity. By the conservation of momentum Þ a ´ b + 0 = (a + c) V Þ \[V=\frac{ab}{a+c}\]