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12 December, 20:37

An object has a mechanical energy of 1575 J and a potential energy of 1265 J.

a. What is the kinetic energy of the object?

b. If the mass of the object is 12 kg, what is its speed?

c. How high above ground is the object?

7. A 5 kg object is moving downward at a speed of 12 m/s. If it is currently 2.6 m above the ground ...

a. What is its kinetic energy?

b. What is its potential energy?

c. What is its mechanical energy?

+1
Answers (1)
  1. 12 December, 23:49
    0
    6.

    A. 1575 - 1265 = 310J

    B. KE 1/2 MV^2

    V=√2·KE/M = √2 (310) / 12 V = 7.2mls

    C. PE = 1265 = mgh

    h = 1265/mg = 1265 / (12) (92) h = 10.8m

    7.

    A. KE = 1/2 mv^2 0.5 (5) (12) ^2 KE = 360J

    B. PE = mgh = (5) (9.8) (2.6) PE = 127.4J

    C. ME = KE + PE = 360 + 127.4 ME = 487.4J
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Home » Physics » An object has a mechanical energy of 1575 J and a potential energy of 1265 J. a. What is the kinetic energy of the object? b. If the mass of the object is 12 kg, what is its speed? c. How high above ground is the object? 7.
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