An object of mass 80 kg is raised to a height of 8 m abovethe ground. If the object is allowed to fall, the K E at 3/4 th way would be:
A 4800 J
B 1600 J
C 3200 J
D none of these
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An object of mass 80 kg is raised to a height of 8 m abovethe ground. If the object is allowed to fall, the K E at 3/4 th way would be:
A 4800 J
B 1600 J
C 3200 J
D none of these
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Answer:
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Explanation:
Given
Mass(m) = 80kg
Height(h) = 8m
Gravity (g) = 10 ms^-1
Formula:
K.E = mgh
= 80 * 10 * 8
= 80*80
= 6400 J this is for 1 one complete motion/Fall from the hight
But in the question they asked K.E at 3/4th position
so = 3/4 * 1 complete motion
= 3/4 * 6400
= 3* 1600
= 4800 J
Hence 4800 j is the required final answer