A small glider is placed against a compressed spring at the bottom of an air tra

Question

A small glider is placed against a compressed spring at the bottom of an air track that slopes upward at an angle of 46.0 above the horizontal. The glider has mass 9.00×102 kg . The spring has 670 N/m and negligible mass. When the spring is released, the glider travels a maximum distance of 1.80 m along the air track before sliding back down. Before reaching this maximum distance, the glider loses contact with the spring.

I just need help with part C. I will include parts A and B so you can follow.

A)What distance was the spring originally compressed? 5.84×102

B)When the glider has traveled along the air track 0.800 m from its initial position against the compressed spring, is it still in contact with the spring?

No

B)When the glider has traveled along the air track 0.800 m from its initial position against the compressed spring, is it still in contact with the spring?

Explanation / Answer

According to conservation of energy
          m g h' sin + KE = 0.5 k x2

Just put the values, and solve the equation.

NOTE: I assumed that part C was about the KE.

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