An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
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ANSWER:-
PE = mgh = 40×9.8×5 = 1960 J
When it is half way down, h = 2.5 m
KE = 1/2 mv²
v² - u² = 2as
v² = 2as + u²
v² = 2×9.8×2.5 + 0²
v² = 49
KE = 1/2 × 40 × 49 = 20×49 = 980 J
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Answer:
PE = 2000
And KE on its half = 1000
Explanation:
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