49. The velocity of 40 kg mass is changed
from 500 to 200 cm s. The loss of
kinetic energy is
a) 625 J
b) 100 J
c) 420 J
d) 180J
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Answer:
loss in kinetic energy
= ½m(v"² - v'²)
= ½×40(5² - 2²)
= ½×40(25 - 4)
= ½×40×21
= 20×21
= 420 j ...answer
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