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

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

Solution

## The correct option is D 140 JAs 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)=140JPhysics

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