a running man has half the kinetic energy that a boy of half his mass has.the man speed up by 1m/s and then has the same kinetic energy as the body. what were the original speeds of man and boy?
How light has a dual nature?
A photon has zero rest mass. Explain how ?
(These questions were posted by Shubham SInha and Ritika Chatak)
The dual nature of light has been established through
A mass 5kg descending vertically,draws up a mass of3kg by means of a light string passing over a pulley.At the end of 4 seconds,the string breaks.How much higher 3 kg mass would go?
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