You are standing on a large sheet of frictionless ice and are holding a large ro

Question

You are standing on a large sheet of frictionless ice and are holding a large rock. In order to get off the ice, you throw the rock so it has velocity relative to the earth of 13.0 m/s at an angle of 36.0 above the horizontal.

Part A

If your mass is 71.0 kg and the rock's mass is 14.6 kg , what is your speed after you throw the rock?

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You are standing on a large sheet of frictionless ice and are holding a large rock. In order to get off the ice, you throw the rock so it has velocity relative to the earth of 13.0 m/s at an angle of 36.0 above the horizontal.

Part A

If your mass is 71.0 kg and the rock's mass is 14.6 kg , what is your speed after you throw the rock?

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Explanation / Answer

rock x component of velocity

urx = 13 cos36 = 10.52 m/s

rock momentum = 14.6*10.52 = 153.55 kg m/s

from conservation of momentum

v = 153.55/71 = 2.16 m/s

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