A body weighing 8 kg is at a height of 2.5 m. Does the body have kinetic energy if its mechanical energy is 300 J?
| March 5, 2021 | education
m = 8 kg.
h = 2.5 m.
g = 9.8 m / s ^ 2.
E = 300 J.
Ek -?
The total mechanical energy E is the sum of the potential En and the kinetic energy Ek of the body.
E = En + Ek.
Ek = E – En.
The potential energy of a body raised above the earth’s surface is determined by the formula: En = m * g * h.
Ek = E – m * g * h.
Ek = 300 J – 8 kg * 2.5 m * 9.8 m / s ^ 2 = 104 J.
Answer: the kinetic energy of the body is Ek = 104 J.
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