AP EAMCET · PHYSICS · Work Power Energy
A body of mass \(2 \mathrm{~kg}\) starts from rest and moves with uniform acceleration. It acquires a velocity \(20 \mathrm{~ms}^{-1}\) in \(4 \mathrm{~s}\). The power exerted on the body in \(2 \mathrm{~s}\) in watts is
- A \(50\)
- B \(100\)
- C \(150\)
- D \(200\)
Answer & Solution
Correct Answer
(B) \(100\)
Step-by-step Solution
Detailed explanation
\(m=2 \mathrm{~kg}, u=0, v=20 \mathrm{~m} / \mathrm{s}, t=4 \mathrm{sec}\) Acceleration \(a=\frac{v-u}{t}=\frac{20-0}{4}=5 \mathrm{~m} / \mathrm{s}^2\) \(\therefore \quad\) Force applied \(F=m a=2 \times 5=10 \mathrm{~N}\) Velocity at the end of \(2 \mathrm{sec}\)…
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