Impulse is the change in momentum. So you just have to subtract 300 -280
The answer would be 20kgm/s
1. The answer is letter D. Position 4. The distance between the two allows the magnet bars to repel against each other.2. The answer is A. it decreases. Once two postitively charge bars are near each other, their force will increase but once they are apart, their force decrease.
