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Question

Given figure shows the vertical section of a frictionless surface. A block of mass 2 kg is released from the position A, its kinetic energy as it reaches the position C is
139483.jpg


A
180 J
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B
140 J
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C
40 J
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D
280 J
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Solution

The correct option is D 140 J
As the there is no external force over it,
 Energy of the body is conserved.
$$\Rightarrow$$ decrease in potential energy of the body = increase in kinetic energy of body.
intially KE=0.
kinetic energy at C=mgh=2(10)(14-7)=140J

Physics

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