Question

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 1

Answer:

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Answer 2

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