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3-part b only please

answers 622 kg and 1242 kg are incorrect for trailer mass

You have a two-wheel trailer that you pull behind your ATV. Two children with a combined mass of 74.2 kg hop on board for a ride through the woods and the springs (one for each wheel)
each compress by 6.17 cm. When you pull the trailer over a tree root in the trail, it oscillates with a period of 2.04 s. Determine the following.
(a) force constant of the springs
N/m
(b) mass of the trailer
kg
(c) frequency of the oscillation
Hz
(d) time it takes for the trailer to bounce up and down 10 times

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