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A particle of rest mass m is moving with a with a velocity 0.9c; then
  • a)
    its relativistic mass is 2.3 m0.
  • b)
    its K.E. is 1.3 m0c2
  • c)
    The expression  is correct only for low velocities.
  • d)
    None of these.
Correct answer is option 'A,B,C'. Can you explain this answer?
Verified Answer
A particle of rest mass m is moving with a with a velocity 0.9c; thena...
The relativistic mass

Given v = 0.9c 
(ii) Kinetic energy is given by

(iii) The expression   is correct only for low velocities which may be verified as follows




In this case we do not have u ≪ c, therefore it is incorrect to use 
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Most Upvoted Answer
A particle of rest mass m is moving with a with a velocity 0.9c; thena...
The relativistic mass

Given v = 0.9c 
(ii) Kinetic energy is given by

(iii) The expression   is correct only for low velocities which may be verified as follows




In this case we do not have u ≪ c, therefore it is incorrect to use 
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A particle of rest mass m is moving with a with a velocity 0.9c; thena)its relativistic mass is 2.3 m0.b)its K.E. is1.3m0c2c)The expressionis correct only for low velocities.d)None of these.Correct answer is option 'A,B,C'. Can you explain this answer?
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