## anonymous one year ago In a closed system, Glider A with a mass of 0.40 kg and a speed of 2.00 m/s collides with Glider B at rest with a mass of 1.20 kg. The two interlock and move off. What speed are they moving? A. 0.50 m/s B. 1.0 m/s C. 2.0 m/s D. 4.0 m/s

1. Michele_Laino

here we have to apply the total momentu conservation law. So we can write this: $\Large {m_1}{v_1} + {m_2}{v_2} = \left( {{m_1} + {m_2}} \right)V$

2. anonymous

ok!

3. Michele_Laino

where V is the requested speed: $\Large V = \frac{{{m_1}{v_1} + {m_2}{v_2}}}{{{m_1} + {m_2}}} = \frac{{0.4 \times 2 + 1.2 \times 0}}{{0.4 + 1.2}} = ...m/\sec$

4. Michele_Laino

$\large V = \frac{{{m_1}{v_1} + {m_2}{v_2}}}{{{m_1} + {m_2}}} = \frac{{0.4 \times 2 + 1.2 \times 0}}{{0.4 + 1.2}} = ...m/\sec$

5. anonymous

so we get 0.5? so choice A is our solution?

6. Michele_Laino

yes! correct!

7. anonymous

yay!! thanks!!:)

8. Michele_Laino

:)