An object with a mass of #4 kg# is hanging from a spring with a constant of #3 (kg)/s^2#. If the spring is stretched by # 10 m#, what is the net force on the object?

Answer 1

#sumF = F_k - mg = 30 - 40 = -10N#

First let's round up gravity #g ~~ 10# Take at the free body diagram a quick check indicate there An inbalance of forces, there is more weight and the spring have stretched enough to balance the weight. The net force is exactly equal to the inbalance: #sumF = F_k - mg = 30 - 40 = -10N#

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Answer 2

Adam Arnold

The net force on the object is 30 N.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.