4. Calculate the kinetic energy of a bullet of mass 20 g and
having a muzzle velocity of 200 m s
5. The kinetic energy of an object of mass mis moving with
a velocity of 12 m s' is 36 ). Find its mass m.
6. A bov runs with a uniform speed of 8 ms on a rough
track against the frictional force of 25 N. Calculate the
power exerted by the boy.
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Answer: The energy (e) of a mass to energy conversion equals the mass (m) that was converted multiplied by the speed of light (c) squared. If we choose mass in kilograms and the speed of light in meters per second, then the answer will be in Joules.
Explanation:
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