This is what e=mc² means.
So rest energy is RH side of equation that is its mass times speed of light squared.
The answer is d because you are using energy to pull the sled back up, which is mechanical energy
Answer:
Explanation:
F=kx
x=F/k
F=2000 kg
x=100 cm=9*10^-3
effective spring constant=k=F/x
k=2000/9*10^-3=2.2*10^-5
now frequency
f=1/2π√k/m
f=1/2*3.14√2.2*10^-5/310
f=1/6.28√7.097*10^-8
f=1/6.28*2.7*10^-4
f=0.16*2.7*10^-4
f=4.32*10^-5
I think you can google this because I really don’t know the answer I’m so sorry
