You stand at the top of a tall building with a stopwatch. you drop a rock off the side of the building, and it takes the rock 1.9 seconds to hit the ground. how fast was the rock going when it hit the ground

18.62m/s

Explanation:

The rate of acceleration that gravity has on an object is 9.8 m/s^2.

In this problem, the object is falling for 1.9 seconds so to solve, you need to plug it into the equation which gives you sp=9.8*1.9.

After multiplying the two numbers, you get an answer of 18.62m/s.

mass and volume are the answers you are looking for

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.