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С осу.Q.4. Certain force acting on a 20 kg masschanges ts velocity from 5 m s-1 to 2 m s-1.Calculate the work done by the force. |
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Answer» Step-by-step EXPLANATION: initial velocity = 5m/s final velocity = 2m/s The WORK done is equal to the change in the kinetic energy of an object W = 1/2 ×m(v²-u²) W = 1/2 ×20×(5²-2²) W=10×25-4 W=10× 21 W=210joules therefore, the work done by force =210joules |
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