An average$-$sized asteroid located $5\mathrm{.}9107$ km from Earth with mass $2\mathrm{.}51013$ kg is detected headed directly toward Earth with speed of $5\mathrm{.}2$ km$/$s$.$ What will its speed be $($in km$/$s$)$ just before it hits our atmosphere? $($You may ignore the size of the asteroid. Assume the height of our atmosphere is $100$ km$.)$An average$-$sized asteroid located $5\mathrm{.}9107$ km from Earth with mass $2\mathrm{.}51013$ kg is detected headed directly toward Earth with speed of $5\mathrm{.}2$ km$/$s$.$ What will its speed be $($in km$/$s$)$ just before it hits our atmosphere? $($You may ignore the size of the asteroid. Assume the height of our atmosphere is $100$ km$.)$