Question

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

Answer 1

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

Answer 2

ok!

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

yes! correct!

Answer 7

yay!! thanks!!:)

Answer 8

:)