Answer:
IDC
Explanation:
I DON'T UNDERSTAND........
Answer: D. They are the coldest stars.
Explanation:
Average speed = distance / time
Average speed = 90 km / 0.5 hrs
Average speed = 180 km per hour
Acceleration=force/mass=28/(10+4)=2m/s^2
force10kg=ma=10*2
force4kg=ma=(10*2)=20
the4 kg is pushing against the 10kg block
vf=vi+at
-10=20*28/14 * t
t=30/2=15sec
i hope this can help you.
Solar energy, wind energy, and hydroelectric energy are all renewable energy