Tires should be replaced when

a. tread depth is low

b. they are cracked

c. air pressure is low

d. a and b

Your answer is A and B

Hope this helps :)

(You can check your treads using the coin test, look it up)

A and B is correct but usually C would be correct but A and B is more correct

answer; increased farm employment;

ek = (m.v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) v2/2

ek = (200 + 250) 2,32/2 = 450*5,29/2 = 1190,25 j

by: nicholas dooley