A boy rides his bicycle which has wheels of radius 31.0 cm. If the boy accelerates from rest to a speed of 11.8 m/s in 30.0 s, what is the angular acceleration (in rad/s2) of the tires?

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

i think its d if wrong im sorry