In an emergency, a driver brings a car to stop in 8.0 s. the car was going 21 m/s when the braking began. what was the stopping distance

84 m.

Step-by-step explanation:

Use an equation of motion under constant acceleration:

initial speed u = 21, final speed v = 0,  time t  = 8, distance s = ?.

s  = (u + v) t  / 2

= (21 + 0)* 8 / 2

= 168 / 2

= 84 m

to have more of what you want like money

step-by-step explanation:

save it by not spending on unnecessary stuff and have more

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: