Answer:


Explanation:
U = Energy = 76 J
x = Displacement of spring = 0.17 m
k = Spring constant
Energy is given by

Force is given by

The magnitude of force must you apply to hold the platform is
.
Now 

Additional energy

Total time elapsed is =8.2y
The starting event is the astronaut leaving Earth. The finishing event is the astronaut arriving at the star system. The time between these events on Earth is:
Δt=3.9ly/0.9c
Δt=4.3y
For the astronaut, two events occur at the same position and can be measured with just one clock. Hence,
Δτ

Δτ

Δτ=1.8ly
The total elapsed time is:
T elapsed=Δt+3.9
T elapsed=4.3+3.9
T elapsed=8.2y
learn more about time from here: brainly.com/question/28208983
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If ur meaning cavins. a cavin is like a cave or a hollow route. idk if thats what ur asking?
Personal ethics come from what you believe in as a person no what u or others like or dislike so ot would be false
Answer:
can u send a picture to identify it
Explanation:
sorry I just need point:/