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certain force acting on a 2kg mass charges its velocity from 5m/s to 2m/s calculate work done by the force |
| Answer» HAT,Initial VELOCITY,U = 5 m/s Final Velocity, v = 2 m/s Mass of the body, m = 2 Kg To find : Work done by the retarding force. According to Work Energy Theorem, Work done by all the forces is equal to the change in Kinetic Energy.W = ∆K W = (Kinetic Energy) - (Kinetic Energy) W = 1/2mv² - 1/2mu² W = m/2(v² - u²) W = 2/2(2² - 5²) W = 4 - 25 W = -21 J Work done by the retarding force is -21 J | |