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Enorla) Detine kinetic(b) The masses of scooter and bike are in theratio of 2.3, but both are moving with thesame speed of 108 kmth.compute the ratioof thels kinetic energy .and how |
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Answer» Answer:a)DEFINATION :- Kinetic Energy of an object is the energy that it possesses due to its motion. It is defined as the WORK needed to accelerate a body of a given mass from REST to its stated velocity. b)Mass of SCOOTER = 2x Mass of Bike = 3x Speed = velocity, v = 108 km/h v = 108 x 5/18 m/s v= 30 m/s K.E. of Scooter = 1/2 x m x [v]^2 =1/2 x 2x x [30]^2 = 1/2 x 2x x 900 = 2x x 450 = 900x J K.E. of Bike = 1/2 x m x [v]^2 = 1/2 x 3x x [30]^2 = 1/2 x 3x x 900 = 3x x 450 = 1350x J Ratio of kinetic energies of Scooter and Bike = 900x J/1350x J = 900 / 1350 = 90 / 135 = 18 / 27 = 2/3 Hence, the ratio of the kinetic energies of the Scooter and Bike is 2:3. |
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