A student had a breakfast of 200 food calories. He thinks of burning this energy by drawing water from the well and watering the trees in his school. Depth of the well is about 25 m. Th e pot can hold 25L of water and each tree requires one pot of water. How many trees can he water? (Neglect the mass of the pot and the energy spent bywalking.Take`g=10ms^(-2)`)

Explanation

To draw 25L of water from the well, the student has to do work against gravity by burning his energy.
Mass of the water`=25L=25kg(1L=1kg)`
The work required to draw 25 kg of water=gravitational potential energy gained by water.
W=mgh=`25xx10xx25=6250J`