Question

One object (m 1) has a mass of 2 kg and moves with a speed of 9 m/s to the right. Another object (m 2) has a mass of 3 kg and moves to the left with a speed on 3 m/s. The two objects collide. After the collision, the first object (m 1) moves to the right with a speed of 1.5 m/s. The second object (m 2) moves to the right at 2 m/s. ----- What is the change in the momentum of the first object (m 1) during the collision? (Remember that "change" is always "final − initial".)

Answer 1

Answer:

-15 Ns

Explanation:

$m_1$ = Mass of first object = 2 kg

$m_2$ = Mass of second object = 3 kg

$u_1$ = Initial Velocity of first object = 9 m/s

$u_2$ = Initial Velocity of second object = -3 m/s

$v_1$ = Final Velocity of first object = 1.5 m/s

$v_2$ = Final Velocity of second object = 2 m/s

Change in linear momentum is given by

$p_1=m(v_1-u_1)\\\Rightarrow p_1=2(1.5-9)\\\Rightarrow p_1=-15\ N.s$

Change in linear momentum of the first object is -15 Ns