Mechanical 43721

A body weighing 2 kg falls from a height of 45 m in a free fall. What will be its potential energy and total mechanical energy after 2 s from the beginning of the movement?

Correct answer:

E =  497.9556 J
E2 =  882.9 J

Step-by-step explanation:

m=2 kg h=45 m t=2 s g=9.81 m/s2  s=21 g t2=21 9.81 22=50981=19.62 m  h2=hs=4519.62=501269=25.38 m  E=m g h2=2 9.81 25.38=497.9556 J
v=g t=9.81 2=50981=19.62 m/s  K=21 m v2=21 2 19.622=384.9444 J  E2=E+K=497.9556+384.9444=108829 J=882.9 J

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