4. An 800 kg wrecking ball needs to achieve a velocity of 50 m/s at the bottom of the swing in order to break through a brick wall. How high
does it need to be pulled in order to achieve this velocity?

Which of the following statement is false ? a.batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c.do not stack batteries on top of each other)d.never put a damaged battery in a dumpster. i