Question

a lemon with mass 0.3 kg falls out of a tree from a height of 1.8 m. How much mechanical energy does the lemon have just before it hits the ground ?

Answer 1

5.30 joules of mechanical energy. Hope I helped!

Answer 2

Answer:

5.292 Joules

Explanation:

Hello

applying the law of the conservation of energy, and assuming that no energy is lost due to friction with the air, we can affirm that the energy that has just before the impact is the same energy that it has just before being released, that energy is due to height, mass and gravity and is defined by:

$E_{g}=m*g*h\\\\now\\E_{p} =E_{g}=m*g*h\\E_{p}=m*g*h$

Let

$m=0.3kg\\g=9.8\frac{m}{s^{2} }\\ h=1.8\ m$

pute the values into the equation

$E_{p}=m*g*h\\E_{p}=0.3 kg*9.8\frac{m}{s^{2} }*1.8\m\\E_{p}=5.292\ Joules$

Have a nice day.