Answer:
in pounds if would be 50.7 or 50.7063
11.Perfectly elastic,as in only this collision K.E is conserved,however momentum is conserved in both elastic and inelastic collisions.
9)must also be conserved.because there is eleastic collision.
8)unchanged.
7)dcreases as velocity changes from 0.5 to 0 m/s.
4)momentum
<h3>
Answer:</h3>
12250 J
<h3>
Explanation:</h3>
<em>elastic potential energy = 0.5 × spring constant × (extension)2</em>
spring constant = 500
extension = 7cm
7^2=49
0.5 × 500 × 49 = 12250 J or 12.25kJ
combustion of fossil fuels would be the correct answer when dealing with the alteration of the carbon cycle.