2. What is meant by acceleration? Write its SI unit. 3. What is a Second class lever? Write any two examples of
4. Why are foundations of tall buildings made wide?
5. What is done to protect tall buildings from thunderstorm?

wkmethingStandard for stands So know but I know quite Not  

1.The rate of change of velocity is known as acceleration.Its SI unit is m/s^2

2.The lever in which the load is located between the effort and the fulcrum.If the load is closer to the effort than the fulcrum, then more effort will be required to move the load. For example-wheelbarrow,bottle opener etc .

3. in order to exert less pressure on the ground and prevent the building from sinking into the ground.

4.In a lightning protection system, a lightning rod is a single component of the system.

to save the day, harry must get past a scary three-headed guard dog.

yes, no, maybe, so i honestly don't know best of luck