What can be said about the sign of the work done by the force f⃗ 1? ?

prolly a beacuse the momentuem the car has increases while going down hill

2b2t

explanation:

2b2t

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.