A bungee cord stretches 25 meters and has a spring constant of 140 N/m. How much energy is stored in the bungee

Explanation:

The potential energy stored in a stretch spring is given by the expression below

PE = Work = force * distance

So:

This then simplifies to:

where k is the spring constant= 140 N/m

Given that x= 25 m

Substituting our data into the expression for P.E stored we have

Hence the energy stored in the spring is 87.5kJ

4

explanation:

4

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5