JEE Mains · Physics · STD 11 - 5. work,energy,power and collision
Velocity-time graph for a body of mass \(10\, kg\) is shown in figure. Work-done on the body in first two seconds of the motion is ................ \(\mathrm{J}\)
- A \(-9300\)
- B \(12000\)
- C \(-4500\)
- D \(-12000\)
Answer & Solution
Correct Answer
(C) \(-4500\)
Step-by-step Solution
Detailed explanation
Acceleration \(\left( a \right) = \frac{{v - 4}}{t} = \frac{{\left( {0 - 50} \right)}}{{\left( {10 - 0} \right)}} = - 5\,m/{s^2}\) \(u = 50\; m/s\) \(\therefore v = u + at =50 - 5t\) Vwlocity in first two second \(t = 2\) \({v_{\left( {at\,t = 2} \right)}} = 40\,m/s\)…
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