Two asteroids in outer space collide, and stick together. the mass of each asteroid, and the velocity of each asteroid before the impact, are known. to find the momentum of the stuck-together asteroids after the impact, what approach would be useful?
(1) use the energy principle.
(2) use the momentum principle.
(3) it depends on whether or not the speed of the asteroids was near the speed of light.
(4) use the relationship among velocity, displacement, and time.
(5) it depends on whether the collision was elastic or inelastic.

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.