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1. Showing lim of v is c when constant F accelerates particle

Problem from textbook reads: "A particle with mass m accelerated from rest by a constant force F will, according to Newtonian mechanics, continue to accelerate without bound. That is, as t goes to infinity, v goes to infinity. Show that, according to relativistic mechanics, the particle's speed...
2. My Signature is not showing in LaTeX.

I have written this in my Signature but the code is showing as usual not transformed. ${\colorbox{blue}{\colorbox{green}{\ Snow-Leopard}}}}$
3. Curve showing the dependence of instantaneous speed upon time

i have 5 exercises in my homework and i've done the rest except for this one. i don't understand the question (Crying)