A plastic block with mass 1.55 kg is placed against a coiled spring at the botto

Question

A plastic block with mass 1.55 kg is placed against a coiled spring at the bottom of a ramp inclined at an angle of 31.0 (point ). When the spring is released, it projects the block up the ramp. At point B, a distance of 4.35 cm up the ramp from A, the block is moving up the ramp at a speed of 7.45 m/s and is no longer in contact with the spring. The coefficient of kinetic friction between the plastic block and ramp is muk= 0.55. The mass of the spring is negligible. Calculate the amount of potential energy that was initially stored in the spring. To do so, you must calculate the total mechanical energy of the spring at point B, plus the amount of energy lost to friction.

Explanation / Answer

Where is ^ getting these numbers?

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