If you slowly lower a 20 kg bad of sand 1.20m from the trunk of the car to the driveway, how much work do you do? Round to the nearest 10th place.

Question

Please write the formula and what the symbols stand for

Answer 1

The work done = mgh = GPE

m= mass = 20kg

g= acceleration due to gravity = 9.8 m/s2

h= height =1.2 m

Work is done by gravity and not you

work done in this case is in the form of available energy = 235.2 J

If you count it as work done by you it is - 235.2 J ( Negative sign)

Here we are assuming air resistance being absent ( slow or fast does not matter as long as h is same)