Question
In: Chemistry
An object with a mass of 49.8 pounds is moving with a uniform velocity of 30.9...
An object with a mass of 49.8 pounds is moving with a uniform velocity of 30.9 miles per hour. Calculate the kinetic energy of this object in joules
Solutions
Expert Solution
Ans. Mass = 49.8 lb = 22.5889 kg ; [1 lb = 0.453592 kg]
Velocity = 30.9 mile/ hr = 13.81354 ; [ 1 mile/h = 0.44704 m/s]
Now.
Kinetic energy of a particle, KE = ½ mv2
Where, m = mass in kg ; v = velocity in ms/
Or, KE = ½ (22.5889 kg) (13.81354 ms-1)2 = 2155.14 kg m2 s-2
Or, KE = 2155.14 J ; [1 kg m2 s-2 = 1 J]
Therefore, KE of the object = 2155.14 J
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