AP EAMCET · PHYSICS · Work Power Energy
A machine which is \(70 \%\) efficient raises a \(10 \mathrm{~kg}\) body through a certain distance and spends \(100 \mathrm{~J}\) energy. The body is then released. On reaching the ground, the kinetic energy of the body will be
- A 0
- B \(70 \mathrm{~J}\)
- C \(50 \mathrm{~J}\)
- D \(35 \mathrm{~J}\)
Answer & Solution
Correct Answer
(B) \(70 \mathrm{~J}\)
Step-by-step Solution
Detailed explanation
Energy spent by the machine to raise the body of mass \(10 \mathrm{~kg}\) at certain height, is \(E=100 \mathrm{~J}\) Since, machine is only \(70 \%\) efficient. Hence, energy used by machine,…
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