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A body of mass 40 Kg covers a distance of 50 m in 5s starting from rest under the influence of a force. What is the work done by the force on the body?

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A body of mass 40 Kg covers a distance of 50 m in 5s starting from rest under the influence of a force. What is the work done by the force on the body?

(a) 8000 J

(b) -8000 J

(c) 20000 J

(d) 800 J

This question was posed to me in homework.

This question is from Work in portion Work, Energy and Power of Physics – Class 11

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Correct answer is (a) 8000 J

The best explanation: Since the distance and time taken are given, we can find out the acceleration of the body by the second equation of motion which is 4 m/s^2. From the second law of motion, the force can be found. Force = 160 N. From the force and the displacement, the work can be found out. Work = 8000 J.

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