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Question 38
9800 joule of energy was spent to raise a mass of 80 kg. The mass was raised to a height of:
Solution
We know that,
Work(W) = Force(F) x Distance(d) and
Force(F) = mass(m) x acceleration due to gravity (g)
We need to find d as the work done is stored as the potential energy in the body and distance will be equal to height
Given, W = 9800 Joules and m = 80 kgs
First find force,
F = 80 x 9.8 (or) 784
Substitute the 'F' value in Work equation,
9800 = 784 x d
d = 12.5Â
Hence, option CÂ is the correct answer.
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