69 i agree with her hope this helps
Answer:
C. pressure
because heat expands and so does explosions and gravity is just gravity.
Answer:

Explanation:
Since the system is in international space station
so here we can say that net force on the system is zero here
so Force by the astronaut on the space station = Force due to space station on boy
so here we know that
mass of boy = 70 kg
acceleration of boy = 
now we know that


now for the space station will be same as above force




Answer: Around 364 to 480
Answer:
send the wagon down a higher hill