Physics
For a relation F = , to hold true, the condition(s) necessary is/are:
- velocities are equal to the velocity of light
- velocities are much smaller than the velocity of light
- mass remains constant
- both (b) and (c)
Laws of Motion
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Answer
both (b) and (c)
Reason — It is observed that the mass of a particle increases with increase in velocity but it becomes perceptible only when the velocity v of the particle is comparable with the speed of light c. At velocities v << c, the change in mass is not perceptible. At such velocities (v << c ), mass m can be considered to be constant. Then Newton's second law takes the form F = = ma.
Thus, for F = = ma to hold true, two conditions are required :
- velocities are much smaller than the velocity of light
- mass remains constant.
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