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Kinetic Energy

The potential...

Question

The potential energy of the block at the top of a rough incline is $20 J$ . If the work done against friction while sliding down is $5 J$ . Then the kinetic energy of block on reaching bottom is

A

15 J

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B

20 J

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C

40 J

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D

50 J

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Solution

The correct option is A $15 J$
$P E = m g h = 20 J$
From $A$ to $B$
Work energy theorem
$△ K E = w_{f r i c t i o n} + w_{g r a v i t y}$
$⟹ K E_{f} - 0 = - 5 + 20 = 15 J$

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