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7.2.3 How do we calculate kinetic energy?


This video on how to calculate an object's kinetic energy.



1. A proton (mass m 1.67 1027 kg) is being accelerated along a straight line at 3.6 1015 m/s2 in a machine. If the proton has an initial speed of 2.4 107 m/s and travels 3.5 cm, what then is (a) its speed and (b) the increase in its kinetic energy?


2. A father racing his son has half the kinetic energy of the son, who has half the mass of the father.The father speeds up by 1.0 m/s and then has the same kinetic energy as the son.What are the original speeds of (a) the father and (b) the son?


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