use consevation of linear momentum
- m1v1+m2v2=(M1+M2)V3
- 281(2.82)+209(-1.72)=(209+281)V2
- 792.42-359.48=490v3
- 432.9=490v3
- V3=0.88m/s
1 astronomical unit = 149597870700m
Enrico should divide distance in meters with this number.
The density of a substance is the ratio of its mass to its volume. So whatever volume you have (call it 
), the density 
is computed by
A.) 3,800
* Add 1800+2000 because they are both going forward, and you are look for the total amount of forward force. Hope this helped good luck!!!
