Question

calculate work done to stop object of mass 40 kg moving with velocity 36 km per hour​

Answer 1

Work done = 2000 J

Explanation:

Mass of object, M = 40kg

Velocity,             v = 36 km/hr

                          v =$36\times\frac{5}{18}$

                          v = 10 m/s

kinetic energy change into workdone,

Kinetic energy,KE = w =$\frac{1}{2}{M\times v^{2}}$

                              = $\frac{1}{2}\times {40 \times100}$

                              = 2000 j.    

Answer 2

your answer is given

attachment :(

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