Q. A body of mass 1000 kg is moving horizontally with a velocity${\ 50\ ms}^{- 1}$. A mass of 250 kg is added. Find the final velocity
A) ${40\ ms}^{- 1}$
B) ${23\ ms}^{- 1}$
C) ${12\ ms}^{- 1}$
D) ${32.5\ ms}^{- 1}$
Explanation
(a) Form conservation of linear momentum
$m_{1}v_{1} = \left( m_{1} + m_{2} \right)v$
$or\ \ 1000 \times 50 = (1000 + 250)v$
$\Longrightarrow \ \ \ v = 40\ {ms}^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.