A 30 kg block is at rest on a surface whose coefficient of static friction is...

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A 30 kg block is at rest on a surface whose coefficient of static friction is...

A 30 kg block is at rest on a surface whose coefficient of static friction is 0.5. A student can pull horizontally with a maximum force of 70 N. How much force must another student apply in the upward direction in order for the crate to just start moving?

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