Mechanical 80527

A stone with a mass of 2 kg falls in free fall from a tower with a height of 80 m. What is its kinetic energy, and what is its potential energy:

a) At the beginning of the fall,
b) In 1 s from the beginning of the fall,
c) Upon impact,
d) What is its mechanical energy relative to the Earth's surface during the fall?

Correct answer:

E1 =  0 J
E2 =  100 J
E3 =  1600 J
E4 =  1600 J

Step-by-step explanation:

m=2 kg h=80 m g=10 m/s2  v1=0 m/s E1=21 m v12=21 2 02=0 J
t2=1 s v2=g t2=10 1=10 m/s  E2=21 m v22=21 2 102=100 J
v3=2 g h=2 10 80=40 m/s  E3=21 m v32=21 2 402=1600 J
E4=m g h=2 10 80=1600 J

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