Achild bounces in a harness suspended from a door frame by three parallel elastic bands. (a) if each elastic band stretches 0.210 m while supporting a 6.80 kg child, what is the force constant for each elastic band?

spring constant of the spring will be equal to 317.33 N/m

Explanation:

We have given mass of the child m = 6.80 kg

Spring is stretched by length of 0.210 m . so x = 0.210 m

Acceleration due to gravity

Force on the child will be equal to

This force will be balanced by spring force

And spring force is equal to F = Kx

So kx = mg

k = 317.33 N /m

So spring constant of the spring will be equal to 317.33 N/m

their crystal patterns have been disrupted by stress

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )