Question

A body of mass 2 kg moving with a velocity of 3 m/sec collides head on with a body of mass 1 kg moving in opposite direction with a velocity of 4 m/sec. After collision, two bodies stick together and move with a common velocity which in m/sec is equal to

• A. 1/4
• B. 1/3
• C. 2/3
• D. ¾

Answer 1

Answer: (C)

2/3

Answer 2

$m _ { 1 } v _ { 1 } - m _ { 2 } v _ { 2 } = \left( m _ { 1 } + m _ { 2 } \right) v$

⇒ $2 \times 3 - 1 \times 4 = ( 2 + 1 ) v$⇒