Unit: WORK & ENERGY
Year: 1993 Question#: 24
Question: Base your answers to questions 24 through 26 on the diagram below which represents a frictionless track. A 10-kilogram block starts from rest at point A and slides along the track.
As the block moves from point A to point B, the total amount of gravitational potential energy changed to kinetic energy is approximately
(1 ) 5 J
(2 ) 20 J
(3 ) 50 J
(4 ) 500 J
What is this question really asking?
Explanation by: DIANA L.
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Answer 1
5 J
INCORRECT
MISTAKE IN CALCULATIONS. TRY AGAIN .
Keep in mind that the total energy at the top of the ramp has to equal the total energy at point B. return to top
Answer 2
20 J
INCORRECT
CHECK YOUR MATH! TRY AGAIN. Keep in mind that the total energy at the top of the ramp has to equal the total energy at point B. return to top
Answer 3
50 J
INCORRECT
CALCULATION ERROR. TRY AGAIN! Keep in mind that the total energy at the top of the ramp has to equal the total energy at point B. return to top
Answer 4
500 J
CORRECT
You correctly used the law of conservation of energy.
EA = 
EB
GPEA = KEBmghA = KEB
(10kg)(10 m/s2)(5.0 m) = KEB
500 J = KEB return to top
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