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1. |
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 |
Answer» B. -8000 J | |