A 5 – foot ladder is placed against a vertical wall. Suppose that the bottom of the ladder slides away from the wall at a rate of 2 ft/sec. How fast is the top of the ladder sliding down the wall when the bottom of ladder is 4 feet away from the wall?

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

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.