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प्रश्न
In the given figure, the block of mass m is dropped from point 'A'. The expression for the kinetic energy of the block when it reaches point 'B' is ______.
पर्याय
`1/2mgy_0^2`
`1/2mgy^2`
mg(y - y0)
mgy0
MCQ
रिकाम्या जागा भरा
उत्तर
In the given figure, the block of mass m is dropped from point 'A'. The expression for the kinetic energy of the block when it reaches point 'B' is mgy0.
Explanation:
According to the law of energy conservation, loss in potential energy = gain in kinetic energy
Hence, –(mg (y – y0) – mgy) = KE – 0
⇒ KE = mgy0
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