The former sears tower in chicago is 443m tall. suppose a book is dropped from the top of the building. what would be the book's velocity a point 221m above the ground?

here we can use energy conservation

like initial kinetic + potential energy is always conserved and it will be same at all points

so we can say

now we can plug in all the given values in it

now divide whole equation by mass "m"

so final speed will be 65.96 m/s

god i hope this !