Answer:
c, 280,000J
Explanation:
You should use the equation KE (Kinetic Energy) = 
m = 2500
v = 15
KE = 
KE = 281250 Joules.
This is consistent with the answer B, as all of the parameters given to you are rounded to 2 significant figures so naturally, the answer should also be rounded to 2 sig figs.
KE = 280,000 J
Answer:
1.31498 kg
0.72050 s
0.72050 s
Explanation:
m = Mass of block
g = Acceleration due to gravity = 9.81 m/s²
k = Spring constant = 100 N/M
x = Displacement = 0.129 m
The force balance is

The mass of the block is 1.31498 kg
Time period is given by

The period of oscillations is 0.72050 s
The time period does not depend on the acceleration due to gravity. It varies with the mass and the spring constant.
Hence, the time period would be the same
B. the mass of the building attracts you upward slightly
Answer:
120 watts
Explanation:
#1: 120 watts
#2: 667 watts
#3: 3 watts
#4: i forgot how to do this one