# You observe a lead brick with a rest mass of 16 kg. What is its apparent...

###### Question:

You observe a lead brick with a rest mass of 16 kg. What is its apparent mass if it is moving away from you at 0.85c? The speed of light is 3 × 108 m/s. Answer in units of kg. (part 2 of 2) What is its apparent mass if you are moving toward it at −0.85c? Answer in units of kg.

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