Covalent bonds are formed through an electrostatic attraction between two oppositely charged ions. Hope this Helps :)
Answer:
convex lens and a concave mirror
mass gram, time sec, temp kelvin, vol liter, dens grams/cm3
Impulse = (force) x (time)
The first impulse was (20 N) x (10 sec) = 200 meters/sec
The second one is (50 N) x (time) and we want it equal to the first one, so
(50 N) x (time) = 200 meters/sec
Divide each side by 50N : Time = 200/50 = <em>4 seconds</em>
By the way, the quantity we're playing with here is the cart's <em>momentum</em>.
