A stationary firework of mass 3.0\,\text{kg} explodes into two pieces. A 1.0\,\text{kg} fragment moves east at 12\,\text{m/s}. What is the velocity of the 2.0\,\text{kg} fragment?

6.0\,\text{m/s} west Momentum conservation: 0=(1)(12)+(2)v\Rightarrow v=-6.0\,\text{m/s} (west).

Conservation of Linear Momentum

AP Physics 1· difficulty 4/5

3.0\,\text{kg}

Explanation

0=(1)(12)+(2)v\Rightarrow v=-6.0\,\text{m/s}

Want 10 more like this — adaptive to your weak spots?