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NCERT Solutions Class 9 Science Solutions for Work and Energy - Exercise 11.5 in Chapter 11 - Work and Energy

Question 14 Work and Energy - Exercise 11.5

Calculate the work required to be done to stop a car of 1500 kg moving at a the velocity of 60 km/h?

Answer:

Given data:

The mass of the body = 1500kg

Velocity v = 60km/hr

\begin{array}{l} =\frac{60 \times 1000 m}{3600 s} \\ =\frac{50}{3} m / s \end{array}

The work required to stop the car = kinetic energy change of the car

\begin{array}{l} =\frac{1}{2} m v^{2}-\frac{1}{2} m(0)^{2} \\ =\frac{1}{2} \times(1500) \times\left(\frac{50}{3}\right)^{2} \\ =208333.3 \mathrm{J} \end{array}

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