4. Dark Energy.
This is the mysterious force causing the expansion of space. No one has ever seen this force.
Answer:
Hiiiiiiii........where r u frm??
Answer:
I am pretty sure it is C
Explanation:
It can be found all over the universe
Answer:
Their efforts would be expressed in units of Joules per second
Explanation:
The unit of their efforts can be derived from the formula of power which is given by the product of mass, acceleration and distance (the product is energy with unit joules) divided by time taken to complete the task (unit is seconds)
Therefore, the unit of their efforts would be joules per second
