What is a type of matter that can only be found in space

The answer is Dark Matter. Roughly 80 percent of the mass of the universe is made up of material that scientists cannot directly observe. This is known as dark matter, this bizarre ingredient does not emit light or energy.

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28. evolution

29. environment, survive, offspring  

explanation:

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