An apple weighs 200g, boy having 25 apples and distributed 5 apples at
every floor till 5th floor, Calculate how much work is done by the boy if the
height from ground to 5th floor is 20m. (gravity=10m/s2
)
25 apples to 1st floor (4 m) ... 20 apples to 2nd floor (8 m)
... etc ... 5 apples to 5th floor (20 m)
g * .2 * [(25 * 4) + (20 * 8) + ... + (5 * 20)]