A spring has a relaxed length of 7 cm and a stiffness of 50 N/m. How much work must you do to change its length from 9 cm to 12 cm?How much work must you do to change its length from 9 cm to 12 cm?
Force needed to reach 9 cm = k . x = 50 . 0.02 = 1 N
Force needed to reach 12 cm = 50 . 0.05 = 2.5 N
Average force needed = 1.75 N
Work done = Force . distance moved = 1.75 . 0.03 = 0.0525 JHow much work must you do to change its length from 9 cm to 12 cm?
Just be patient!
water it, it will grow
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