Assume that the stopping distance of a can varies directly with the square of the speed. A van travelling 20 miles per hour can stop in 30 feet. If the van is travelling 24 miles per hour, what is it’s stopping distance?

43.2 feet

Step-by-step explanation:

D = k × speed²

30 = k × 20²

k = 3/40

D = (3/40) × 24²

D = 216/5

= 43.2 feet

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.