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Theoretical Verification of Law of Conservation

A block of ma...

Question

A block of mass 50 kg is pulled up a slope with constant speed by applying an external force of 20 kgf parallel to the slope. The block moves through a distance of 4 m along the slope.

i) What is the work done by the external applied force?

ii) What is the energy stored when it reaches the vertical height of 3m (g = 10m/s²)

A

800J, 1500J

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B

920J, 1530J

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C

805J, 1670J

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D

700J, 1590J

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Solution

The correct option is A
800J, 1500J

i) W = F ´ s = (20 ´ 10) ´ 4 = 800J

ii) Potential Energy = 50 ´ 10 ´ 3 = 1500J

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