Twin sisters, gwen and jackie, were both 20 years old in the year 2000. jackie took off on a round trip to vega, 25 light years away. she traveled at an average speed very close to the speed of light—say, 0.c. according to gwen back on earth, about how long does it take jackie to reach vega?

and 1and 1

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2