According to Porter's five forces model, a student's choice of lunch options at a large food court would be an example of a strong force for .

Threat of substitutions.

Explanation:

Th threat of substitution is defined as the availability of a product that the consumer can purchase instead of the industry's product. The student chooses to buy from the food court despite being in a position to buy from other places with the similar product.The threat of a substitute is the level of risk that a food court faces from replacement by its substitutes.

fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

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.