A moving body of mass m and velocity 3 km/hour collides with a rest body of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity?

Question

Accepted Answer

Correct answer: C. (c): Mass of body (m_1 )=m; Velocity of first body (u_1 )=3 km/hour; Mass of second body in rest (m_2 )=2m and velocity of second body (u_2 )=0. After combination, mass of the body M=m+2m=3m From the law of conservation of momentum, we get Mv=m_1u_1+m_2u_2 or 3 mv= (m 3 )+ (2m 0 )=3m or v=1 km/hour.

$A moving body of mass m and velocity 3 km/hour collides with a rest body of mass 2 m and sticks to it. Now the combined mass starts to move. What will be the combined velocity?$

Solution

More Collision & Variable Mass PYQs